经典下拉菜单代码

最近在编写网页，需要下拉菜单 ，找到一个代码，发现效果不错，阅读之后知道实际是用层实现了菜单项，除此之外，菜单能实现透明，可以变换菜单背景颜色，还能添加背景图片和类似windows中应用程序菜单中文字旁边的标识图片。可以说代码非常优秀！

var mmenus    = new Array();
var misShow   = new Boolean(); 
misShow=false;
var misdown   = new Boolean();
misdown=false;
var mnumberofsub=0;
var musestatus=false;
var mpopTimer = 0;
mmenucolor='#FFFFFF';mfontcolor='MenuText';mmenuoutcolor='#ADEF34';mmenuincolor='#B5E74E';mmenuoutbordercolor='#ECFA3A';mmenuinbordercolor='#5A2614';mmidoutcolor='#A9DA1D';mmidincolor='#799310';mmenuovercolor='#004080';mitemedge='0';msubedge='1';mmenuunitwidth=108;mmenuitemwidth=130;mmenuheight=28;mmenuwidth='100%';mmenuadjust=0;mmenuadjustV=0;mfonts='font-family: 宋体; font-size: 9pt; color: MenuText; ';mcursor='hand';
//mmenubackground='images/Menuback.jpg' //也可以直接设置主菜单的背景图片，同时注意也要相应修改代码
var swipeSteps = 4;
var swipemsec = 25;
var swipeArray = new Array();
function swipe(el, dir, steps, msec) {
 if (steps == null) steps = swipeSteps;
 if (msec == null) msec = swipemsec;
 if (el.swipeIndex == null)
  el.swipeIndex = swipeArray.length;
 if (el.swipeTimer != null)
  window.clearTimeout(el.swipeTimer);
 swipeArray[el.swipeIndex] = el;
 el.style.clip = "rect(-99999, 99999, 99999, -99999)";
 if (el.swipeCounter == null || el.swipeCounter == 0) {
  el.orgLeft  = el.offsetLeft;
  el.orgTop  = el.offsetTop;
  el.orgWidth = el.offsetWidth;
  el.orgHeight  = el.offsetHeight;
 }
 el.swipeCounter = steps;
 el.style.clip = "rect(0,0,0,0)";
 window.setTimeout("repeat(" + dir + "," + el.swipeIndex + "," + steps + "," + msec + ")", msec);
}
function repeat(dir, index, steps, msec) {
 el = swipeArray[index];
 var left   = el.orgLeft;
 var top    = el.orgTop;
 var width  = el.orgWidth;
 var height = el.orgHeight;
 if (el.swipeCounter == 0) {
  el.style.clip = "rect(-99999, 99999, 99999, -99999)";
  return;
 }
 else {
  el.swipeCounter--;
  el.style.visibility = "visible";
  switch (dir) {
   case 2:
    el.style.clip = "rect(" + height*el.swipeCounter/steps + "," + width + "," + height + "," + 0 + ")";
    el.style.top  = top - height*el.swipeCounter/steps;
    break;
   case 8:
    el.style.clip = "rect(" + 0 + "," + width + "," + height*(steps-el.swipeCounter)/steps + "," + 0 + ")";
    el.style.top  = top + height*el.swipeCounter/steps;
    break;
   case 6:
    el.style.clip = "rect(" + 0 + "," + width + "," + height + "," + width*(el.swipeCounter)/steps + ")";
    el.style.left  = left - width*el.swipeCounter/steps;
    break;
   case 4:
    el.style.clip = "rect(" + 0 + "," + width*(swipeSteps - el.swipeCounter)/steps + "," + height + "," + 0 + ")";
    el.style.left  = left + width*el.swipeCounter/steps;
    break;
  }
  
  el.swipeTimer = window.setTimeout("repeat(" + dir + "," + index + "," + steps + "," + msec + ")", msec);
 }
}
var mtmpleft="";
var mtmptop="";
function hideSwipe(el) {
 window.clearTimeout(el.swipeTimer);
 el.style.visibility = "hidden";
 el.style.clip = "rect(-99999, 99999, 99999, -99999)";
 el.swipeCounter = 0;
 if(mtmpleft!="")el.style.left = mtmpleft;
 if(mtmptop!="")el.style.top = mtmptop;
}

function stoperror(){
return true;
}
window.onerror=stoperror;
function mpopOut() {
mpopTimer = setTimeout('mallhide()', 500);
}
function getReal(el, type, value) {
 temp = el;
 while ((temp != null) && (temp.tagName != "BODY")) {
  if (eval("temp." + type) == value) {
   el = temp;
   return el;
  }
  temp = temp.parentElement;
 }
 return el;
}

function mMenuRegister(menu) 
{
  mmenus[mmenus.length] = menu
  return (mmenus.length - 1)
}

function mMenuItem(caption,command,target,isline,statustxt,level,img,sizex,sizey,pos){
 this.items = new Array();
 this.caption=caption;
 this.command=command;
 this.target=target;

 this.isline=isline;
 this.statustxt=statustxt;
 if(level!=null){mnumberofsub++;
 this.hasc=mnumberofsub;}
 this.level=level;
 this.img=img;
 this.sizex=sizex;
 this.sizey=sizey;
 this.pos=pos;
}

function mMenu(caption,command,target,img,sizex,sizey,pos){
 this.items = new Array();
 this.caption=caption;
 this.command=command;
 this.target=target;
 this.img=img;
 this.sizex=sizex;
 this.sizey=sizey;
 this.pos=pos;
 this.id=mMenuRegister(this);
}
function mMenuAddItem(item)
{
  this.items[this.items.length] = item
  item.parent = this.id;
  this.children=true;
}

mMenu.prototype.addItem = mMenuAddItem;
mMenuItem.prototype.addsubItem = mMenuAddItem;

function mtoout(src){

src.style.borderLeftColor=mmenuoutbordercolor;
src.style.borderRightColor=mmenuinbordercolor;
src.style.borderTopColor=mmenuoutbordercolor;
src.style.borderBottomColor=mmenuinbordercolor;
src.style.backgroundColor=mmenuoutcolor;
src.style.color=mmenuovercolor;
}
function mtoin(src){

src.style.borderLeftColor=mmenuinbordercolor;
src.style.borderRightColor=mmenuoutbordercolor;
src.style.borderTopColor=mmenuinbordercolor;
src.style.borderBottomColor=mmenuoutbordercolor;
src.style.backgroundColor=mmenuincolor;
src.style.color=mmenuovercolor;
}
function mnochange(src){
src.style.borderLeftColor=mmenucolor;
src.style.borderRightColor=mmenucolor;
src.style.borderTopColor=mmenucolor;
src.style.borderBottomColor=mmenucolor;
src.style.backgroundColor='';
src.style.color=mfontcolor;

}
function mallhide(){
 for(var nummenu=0;nummenu<mmenus.length;nummenu++){
  var themenu=document.all['mMenu'+nummenu]
  var themenudiv=document.all['mmenudiv'+nummenu]
                mnochange(themenu);
                mmenuhide(themenudiv);
                }
        for(nummenu=1;nummenu<=mnumberofsub;nummenu++){  
         var thesub=document.all['msubmenudiv'+nummenu]      
         msubmenuhide(thesub);
         mnochange(document.all['mp'+nummenu]);
         document.all["mitem"+nummenu].style.color=mfontcolor;
         }
}
function mmenuhide(menuid){
menuid.style.filter='Alpha(Opacity=100)';
hideSwipe(menuid);
misShow=false;
}
function msubmenuhide(menuid){
menuid.style.filter='Alpha(Opacity=100)';
menuid.style.visibility='hidden';
}
function mmenushow(menuid,pid){
menuid.style.filter='Alpha(Opacity=80)';
menuid.style.left=mposflag.offsetLeft+pid.offsetLeft+mmenuadjust;menuid.style.top=mposflag.offsetTop+mmenutable.offsetHeight+mmenuadjustV;
if(mmenuitemwidth+parseInt(menuid.style.left)>document.body.clientWidth+document.body.scrollLeft)
menuid.style.left=document.body.clientWidth+document.body.scrollLeft-mmenuitemwidth;
mtmpleft=menuid.style.left;mtmptop=menuid.style.top;swipe(menuid,2,4);
misShow=true;
}
function mshowsubmenu(menuid,pid,rid){
menuid.style.filter='Alpha(Opacity=80)';
menuid.style.left=pid.offsetWidth+rid.offsetLeft;
menuid.style.top=pid.offsetTop+rid.offsetTop-3;
if(mmenuitemwidth+parseInt(menuid.style.left)>document.body.clientWidth+document.body.scrollLeft)
menuid.style.left=document.body.clientWidth+document.body.scrollLeft-mmenuitemwidth;
menuid.style.visibility='visible';
}
function mmenu_over(menuid,x){
toel = getReal(window.event.toElement, "className", "coolButton");
fromel = getReal(window.event.fromElement, "className", "coolButton");
if (toel == fromel) return;
if(x<0){
  misShow = false;
  mallhide();
  mtoout(eval("mMenu"+x));
}else{

  mallhide();
  mtoin(eval("mMenu"+x));
  mmenushow(menuid,eval("mMenu"+x));

}
clearTimeout(mpopTimer);
}
function mmenu_out(x){
toel = getReal(window.event.toElement, "className", "coolButton");
fromel = getReal(window.event.fromElement, "className", "coolButton");
if (toel == fromel) return;
if (misShow){
mtoin(eval("mMenu"+x));
}else{
mnochange(eval("mMenu"+x));
}
mpopOut()
}
function mmenu_down(menuid,x){
  if(misShow){
  mmenuhide(menuid);
  mtoout(eval("mMenu"+x));
  }
  else{
  mtoin(eval("mMenu"+x));
  mmenushow(menuid,eval("mMenu"+x));
  misdown=true;
  }
}
function mmenu_up(){
  misdown=false;
}
function mmenuitem_over(menuid,item,x,j,i){
toel = getReal(window.event.toElement, "className", "coolButton");
fromel = getReal(window.event.fromElement, "className", "coolButton");
if (toel == fromel) return;
srcel = getReal(window.event.srcElement, "className", "coolButton");
        for(nummenu=1;nummenu<=mnumberofsub;nummenu++){  
         var thesub=document.all['msubmenudiv'+nummenu] 
         if(!(menuid==thesub||menuid.style.tag>=thesub.style.tag)){
         msubmenuhide(thesub);
         mnochange(document.all['mp'+nummenu]);
         document.all["mitem"+nummenu].style.color=mfontcolor;
         }
        }
if(item)document.all["mitem"+item].style.color=mmenuovercolor;
if(misdown||item){
 mtoin(srcel);
}
else{
 mtoout(srcel);
}
if(x==-1)mthestatus=eval("msub"+j).items[i].statustxt;
if(j==-1)mthestatus=mmenus[x].items[i].statustxt;
if(mthestatus!=""){
 musestatus=true;
 window.status=mthestatus;
}
clearTimeout(mpopTimer);
}
function mmenuitem_out(hassub){
toel = getReal(window.event.toElement, "className", "coolButton");
fromel = getReal(window.event.fromElement, "className", "coolButton");
if (toel == fromel) return;
srcel = getReal(window.event.srcElement, "className", "coolButton");
if(!hassub)mnochange(srcel);
if(musestatus)window.status="";
mpopOut()
}
function mmenuitem_down(){
srcel = getReal(window.event.srcElement, "className", "coolButton");
mtoin(srcel)
misdown=true;
}
function mmenuitem_up(){
srcel = getReal(window.event.srcElement, "className", "coolButton");
mtoout(srcel)
misdown=false;
}
function mexec3(j,i){
var cmd;
if(eval("msub"+j).items[i].target=="blank"){
  cmd = "window.open('"+eval("msub"+j).items[i].command+"')";
}else{
  cmd = eval("msub"+j).items[i].target+".location=/""+eval("msub"+j).items[i].command+"/"";
}
eval(cmd);
}
function mexec2(x){
var cmd;
if(mmenus[x].target=="blank"){
  cmd = "window.open('"+mmenus[x].command+"')";
}else{
  cmd = mmenus[x].target+".location=/""+mmenus[x].command+"/"";
}
eval(cmd);
}
function mexec(x,i){
var cmd;
if(mmenus[x].items[i].target=="blank"){
  cmd = "window.open('"+mmenus[x].items[i].command+"')";
}else{
  cmd = mmenus[x].items[i].target+".location=/""+mmenus[x].items[i].command+"/"";
}
eval(cmd);
}
function mbody_click(){

if (misShow){
 srcel = getReal(window.event.srcElement, "className", "coolButton");
 for(var x=0;x<=mmenus.length;x++){
  if(srcel.id=="mMenu"+x)
  return;
 }
 for(x=1;x<=mnumberofsub;x++){
  if(srcel.id=="mp"+x)
  return;
 }
 mallhide();
}
}
document.onclick=mbody_click;

function mwritetodocument(){
      var mwb=0;
                     var stringx='<div id="mposflag" style="position:absolute;"></div><table id=mmenutable border=0 align=center background="images/Menuback.jpg" width='+mmenuwidth+' height='+mmenuheight+' bgcolor='+mmenucolor+
                     ' onselectstart="event.returnValue=false"'+
                     ' style="filter:Alpha(Opacity=80);cursor:'+mcursor+';'+mfonts+
                     ' border-left: '+mwb+'px solid '+mmenuoutbordercolor+';'+
                     ' border-right: '+mwb+'px solid '+mmenuinbordercolor+'; '+
                     'border-top: '+mwb+'px solid '+mmenuoutbordercolor+'; '+
                     'border-bottom: '+mwb+'px solid '+mmenuinbordercolor+'; padding:0px"><tr>'
                     for(var x=0;x<mmenus.length;x++){
                      var thismenu=mmenus[x];
                      var imgsize="";
                      if(thismenu.sizex!="0"||thismenu.sizey!="0")imgsize=" width="+thismenu.sizex+" height="+thismenu.sizey;
                      var ifspace="";
                      if(thismenu.caption!="")ifspace=" ";
                      stringx += "<td nowrap class=coolButton id=mMenu"+x+" style='border: "+mitemedge+"px solid "+mmenucolor+
                      "' width="+mmenuunitwidth+"px onmouseover=mmenu_over(mmenudiv"+x+
                      ","+x+") onmouseout=mmenu_out("+x+
                      ") onmousedown=mmenu_down(mmenudiv"+x+","+x+")";
                            if(thismenu.command!=""){
                                stringx += " onmouseup=mmenu_up();mexec2("+x+");";
                            }else{
                               stringx += " onmouseup=mmenu_up()";
                            }
                            if(thismenu.pos=="0"){
                                stringx += " align=center><img align=absmiddle src='"+thismenu.img+"'"+imgsize+">"+ifspace+thismenu.caption+"</td>"; 
                            }else if(thismenu.pos=="1"){
                                stringx += " align=center>"+thismenu.caption+ifspace+"<img align=absmiddle src='"+thismenu.img+"'"+imgsize+"></td>"; 
                            }else if(thismenu.pos=="2"){
                                stringx += " align=center background='"+thismenu.img+"'> "+thismenu.caption+" </td>"; 
                            }else if(thismenu.pos=="3"){
                                stringx += " align=center background='"+thismenu.img+"'"+imgsize+"> "+thismenu.caption+" </td>"; 
                            }else{
                                stringx += " align=center> "+thismenu.caption+" </td>";
                            }
                      stringx += "";
                     }
                     stringx+="</tr></table>";
                     
                     
                     for(var x=0;x<mmenus.length;x++){
                      thismenu=mmenus[x];
                        if(x<0){
                        stringx+='<div id=mmenudiv'+x+' style="visiable:none"></div>';
                        }else{
                        stringx+='<div id=mmenudiv'+x+
                        ' style="filter:Alpha(Opacity=80);cursor:'+mcursor+';position:absolute;'+
                        'width:'+mmenuitemwidth+'px; z-index:'+(x+100);
                        if(mmenuinbordercolor!=mmenuoutbordercolor&&msubedge=="0"){
                        stringx+=';border-left: 1px solid '+mmidoutcolor+
                        ';border-top: 1px solid '+mmidoutcolor;}
                        stringx+=';border-right: 1px solid '+mmenuinbordercolor+
                        ';border-bottom: 1px solid '+mmenuinbordercolor+';visibility:hidden" onselectstart="event.returnValue=false">/n'+
                      '<table  width="100%" border="0" height="100%" align="center" cellpadding="0" cellspacing="2" '+
                      'style="'+mfonts+' border-left: 1px solid '+mmenuoutbordercolor;
                      if(mmenuinbordercolor!=mmenuoutbordercolor&&msubedge=="0"){
                      stringx+=';border-right: 1px solid '+mmidincolor+
                      ';border-bottom: 1px solid '+mmidincolor;}
                      stringx+=';border-top: 1px solid '+mmenuoutbordercolor+
                      ';padding: 4px" bgcolor='+mmenucolor+'>/n'
                      for(var i=0;i<thismenu.items.length;i++){
                       var thismenuitem=thismenu.items[i];
                       var imgsize="";
                              if(thismenuitem.sizex!="0"||thismenuitem.sizey!="0")imgsize=" width="+thismenuitem.sizex+" height="+thismenuitem.sizey;
                              var ifspace="";
                              if(thismenu.caption!="")ifspace=" ";
                       if(thismenuitem.hasc!=null){
                       stringx += "<tr><td id=mp"+thismenuitem.hasc+" class=coolButton style='border: "+mitemedge+"px solid "+mmenucolor+
                       "' width=100% onmouseout=mmenuitem_out(true) onmouseover=/"mmenuitem_over(mmenudiv"+x+
                       ",'"+thismenuitem.hasc+"',"+x+",-1,"+i+");mshowsubmenu(msubmenudiv"+thismenuitem.hasc+",mp"+thismenuitem.hasc+",mmenudiv"+x+");/""+
                       "><table id=mitem"+thismenuitem.hasc+" cellspacing='0' cellpadding='0' border='0' width='100%' style='"+mfonts+"'><tr><td ";
                         if(thismenuitem.pos=="0"){
                                  stringx += "><img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+">"+ifspace+thismenuitem.caption+"</td><td"; 
                                }else if(thismenuitem.pos=="1"){
                                  stringx += ">"+thismenuitem.caption+ifspace+"<img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+"></td><td";
                                }else if(thismenuitem.pos=="2"){
                                  stringx += "background='"+thismenuitem.img+"'>"+thismenuitem.caption+"</td><td background='"+thismenuitem.img+"'"; 
                                }else{
                                  stringx += ">"+thismenuitem.caption+"</td><td";
                                }
                         stringx += " align=right width='1'><font face='Webdings' style='font-size: 6pt'>4</font></td></tr></table></td></tr>/n";                       
                       }else if(!thismenuitem.isline){
                       stringx += "<tr><td class=coolButton style='border: "+mitemedge+"px solid "+mmenucolor+
                       "' width=100% height=15px onmouseover=/"mmenuitem_over(mmenudiv"+x+
                       ",false,"+x+",-1,"+i+");/" onmouseout=mmenuitem_out() onmousedown=mmenuitem_down() onmouseup=";
     stringx += "mmenuitem_up();mexec("+x+","+i+"); ";
       if(thismenuitem.pos=="0"){
                                  stringx += "><img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+">"+ifspace+thismenuitem.caption+"</td></tr>"; 
                                }else if(thismenuitem.pos=="1"){
                                  stringx += ">"+thismenuitem.caption+ifspace+"<img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+"></td></tr>"; 
                                }else if(thismenuitem.pos=="2"){
                                  stringx += "background='"+thismenuitem.img+"'>"+thismenuitem.caption+"</td></tr>"; 
                                }else{
                                  stringx += ">"+thismenuitem.caption+"</td></tr>";
                                }
     }else{
                       stringx+='<tr><td height="1" background="/images/hr.gif" onmousemove="clearTimeout(mpopTimer);"><img height="1" width="1" src="none.gif" border="0"></td></tr>/n';
                       }
                      }stringx+='</table>/n</div>'
                      }                      
                }
                
for(var j=1;j<=mnumberofsub;j++){     
thisitem=eval("msub"+j);
stringx+='<div id=msubmenudiv'+j+
                        ' style="filter:Alpha(Opacity=80);tag:'+thisitem.level+';cursor:'+mcursor+';position:absolute;'+
                        'width:'+mmenuitemwidth+'px; z-index:'+(j+200);
                        if(mmenuinbordercolor!=mmenuoutbordercolor&&msubedge=="0"){
                        stringx+=';border-left: 1px solid '+mmidoutcolor+
                        ';border-top: 1px solid '+mmidoutcolor;}
                        stringx+=';border-right: 1px solid '+mmenuinbordercolor+
                        ';border-bottom: 1px solid '+mmenuinbordercolor+';visibility:hidden" onselectstart="event.returnValue=false">/n'+
                      '<table  width="100%" border="0" height="100%" align="center" cellpadding="0" cellspacing="2" '+
                      'style="'+mfonts+' border-left: 1px solid '+mmenuoutbordercolor;
                      if(mmenuinbordercolor!=mmenuoutbordercolor&&msubedge=="0"){
                      stringx+=';border-right: 1px solid '+mmidincolor+
                      ';border-bottom: 1px solid '+mmidincolor;}
                      stringx+=';border-top: 1px solid '+mmenuoutbordercolor+
                      ';padding: 4px" bgcolor='+mmenucolor+'>/n'
                      for(var i=0;i<thisitem.items.length;i++){
                       var thismenuitem=thisitem.items[i];
                       var imgsize="";
                              if(thismenuitem.sizex!="0"||thismenuitem.sizey!="0")imgsize=" width="+thismenuitem.sizex+" height="+thismenuitem.sizey;
                              var ifspace="";
                              if(thismenu.caption!="")ifspace=" ";
                       if(thismenuitem.hasc!=null){
                       stringx += "<tr><td id=mp"+thismenuitem.hasc+" class=coolButton style='border: "+mitemedge+"px solid "+mmenucolor+
                       "' width=100% onmouseout=mmenuitem_out(true) onmouseover=/"mmenuitem_over(msubmenudiv"+j+
                       ",'"+thismenuitem.hasc+"',-1,"+j+","+i+");mshowsubmenu(msubmenudiv"+thismenuitem.hasc+",mp"+thismenuitem.hasc+",msubmenudiv"+j+");/""+
                       "><table id=mitem"+thismenuitem.hasc+" cellspacing='0' cellpadding='0' border='0' width='100%' style='"+mfonts+"'><tr><td ";
                         if(thismenuitem.pos=="0"){
                                  stringx += "><img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+">"+ifspace+thismenuitem.caption+"</td><td"; 
                                }else if(thismenuitem.pos=="1"){
                                  stringx += ">"+thismenuitem.caption+ifspace+"<img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+"></td><td";
                                }else if(thismenuitem.pos=="2"){
                                  stringx += "background='"+thismenuitem.img+"'>"+thismenuitem.caption+"</td><td background='"+thismenuitem.img+"'"; 
                                }else{
                                  stringx += ">"+thismenuitem.caption+"</td><td";
                                }
                         stringx += " align=right width='1'><font face='Webdings' style='font-size: 6pt'>4</font></td></tr></table></td></tr>/n";                       
                       }else if(!thismenuitem.isline){
                       stringx += "<tr><td class=coolButton style='border: "+mitemedge+"px solid "+mmenucolor+
                       "' width=100% height=15px onmouseover=/"mmenuitem_over(msubmenudiv"+j+
                       ",false,-1,"+j+","+i+");/" onmouseout=mmenuitem_out() onmousedown=mmenuitem_down() onmouseup=";
                       stringx += "mmenuitem_up();mexec3("+j+","+i+"); ";
     if(thismenuitem.pos=="0"){
                                  stringx += "><img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+">"+ifspace+thismenuitem.caption+"</td></tr>"; 
                                }else if(thismenuitem.pos=="1"){
                                  stringx += ">"+thismenuitem.caption+ifspace+"<img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+"></td></tr>"; 
                                }else if(thismenuitem.pos=="2"){
                                  stringx += "background='"+thismenuitem.img+"'>"+thismenuitem.caption+"</td></tr>"; 
                                }else{
                                  stringx += ">"+thismenuitem.caption+"</td></tr>";
                                }
                              }else{
                       stringx+='<tr><td height="1" background="" onmousemove="clearTimeout(mpopTimer);"><img height="1" width="1" src="none.gif" border="0"></td></tr>/n';
                       }
                      }
stringx+='</table>/n</div>'
}
       document.write("<div align='center' id='JsMenuCSS'>"+stringx+"</div>");
}

mpmenu1=new mMenu('教师队伍','/','self','images/z.jpg','','','3');
mpmenu1.addItem(new mMenuItem(' 课程负责人','/register.asp','self',false,'课程负责人',null,'','','',''));
mpmenu1.addItem(new mMenuItem(' 主讲教师','/login.asp','self',false,'主讲教师',null,'','','',''));
mpmenu1.addItem(new mMenuItem(' 队伍结构','/login.asp?action=logout','self',false,'队伍结构',null,'','','',''));
mpmenu1.addItem(new mMenuItem(' 教学改革与技术服务','/bbs/MYMODIFY.ASP','self',false,'教学改革与技术服务',null,'','','',''));

mpmenu2=new mMenu('教学内容','/SoftDown/','self','images/z.jpg','','','3');
mpmenu2.addItem(new mMenuItem(' 课程定位','/softdown/index.asp?CateID=1','self',false,'课程定位',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 课程设计','/softdown/index.asp?CateID=2','self',false,'课程设计',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 课程特色','/softdown/index.asp?CateID=3','self',false,'课程特色',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 目前存在不足','/softdown/index.asp?CateID=4','self',false,'目前存在不足',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 内容选取组织','/softdown/index.asp?CateID=5','self',false,'内容选取组织',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 教材及相关材料','/softdown/index.asp?CateID=6','self',false,'教材及相关材料',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 教学大纲','/softdown/index.asp?CateID=7','self',false,'教学大纲',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 作业习题','/softdown/index.asp?CateID=8','self',false,'作业习题',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 试题','/softdown/index.asp?CateID=9','self',false,'试题',null,'','','',''));

mpmenu3=new mMenu('课程学习','/SoftSchool/','self','images/z.jpg','','','3');
mpmenu3.addItem(new mMenuItem(' 电子教案','/SoftSchool/Index.Asp?CateID=1','self',false,'电子教案',null,'','','',''));
mpmenu3.addItem(new mMenuItem(' 电子课件','/SoftSchool/Index.Asp?CateID=2','self',false,'电子课件',null,'','','',''));
mpmenu3.addItem(new mMenuItem(' 实训项目','/SoftSchool/Index.Asp?CateID=3','self',false,'实训项目',null,'','','',''));
mpmenu3.addItem(new mMenuItem(' 实训录像','/SoftSchool/Index.Asp?CateID=4','self',false,'实训录像',null,'','','',''));

mpmenu4=new mMenu('教学方法手段','/Develop/','self','images/z.jpg','','','3');
mpmenu4.addItem(new mMenuItem(' 教学设计','/Develop/Index.Asp?CateID=1','self',false,'教学设计',null,'','','',''));
mpmenu4.addItem(new mMenuItem(' 教学方法','/Develop/Index.Asp?CateID=10','self',false,'教学方法',null,'','','',''));
mpmenu4.addItem(new mMenuItem(' 教学手段','/Develop/Index.Asp?CateID=2','self',false,'教学手段',null,'','','',''));
mpmenu4.addItem(new mMenuItem(' 教学改革','/Develop/Index.Asp?CateID=3','self',false,'教学改革',null,'','','',''));
mpmenu4.addItem(new mMenuItem(' 教学效果','/Develop/Index.Asp?CateID=4','self',false,'教学效果',null,'','','',''));
mpmenu4.addItem(new mMenuItem(' 网络教学环境','/Develop/Index.Asp?CateID=5','self',false,'网络教学环境',null,'','','',''));

mpmenu5=new mMenu('实践教学','/Lunwen/','self','images/z.jpg','','','3');
mpmenu5.addItem(new mMenuItem(' 校内实训条件','/Lunwen/Index.Asp?CateID=1','self',false,'校内实训条件',null,'','','',''));
mpmenu5.addItem(new mMenuItem(' 校外实习环境','/Lunwen/Index.Asp?CateID=2','self',false,'校外实习环境',null,'','','',''));

mpmenu6=new mMenu('教学效果','/bbs/','self','images/z.jpg','','','3');
mpmenu6.addItem(new mMenuItem(' 校外专家评价','/Club/ftp/','self',false,'校外专家评价',null,'','','',''));
mpmenu6.addItem(new mMenuItem(' 行业企业评价','/bbs/list.asp?boardid=1','self',false,'行业企业评价',null,'','','',''));
mpmenu6.addItem(new mMenuItem(' 校内监督评价','/bbs/list.asp?boardid=2','self',false,'校内监督评价',null,'','','',''));
mpmenu6.addItem(new mMenuItem(' 学生评价','/bbs/list.asp?boardid=17','self',false,'学生评价',null,'','','',''));
mpmenu6.addItem(new mMenuItem(' 社会评价','/bbs/MYMODIFY.ASP','self',false,'社会评价',null,'','','',''));

mpmenu7=new mMenu('政策支持','','self','images/z.jpg','','','3');
mpmenu7.addItem(new mMenuItem(' 关于本系统','','self',false,'Make By－－IMUT',null,'','','',''));

其中

                            if(thismenu.pos=="0"){
                                stringx += " align=center><img align=absmiddle src='"+thismenu.img+"'"+imgsize+">"+ifspace+thismenu.caption+"</td>"; 
                            }else if(thismenu.pos=="1"){
                                stringx += " align=center>"+thismenu.caption+ifspace+"<img align=absmiddle src='"+thismenu.img+"'"+imgsize+"></td>"; 
                            }else if(thismenu.pos=="2"){
                                stringx += " align=center background='"+thismenu.img+"'> "+thismenu.caption+" </td>"; 
                            }else if(thismenu.pos=="3"){
                                stringx += " align=center background='"+thismenu.img+"'"+imgsize+"> "+thismenu.caption+" </td>"; 
                            }else{
                                stringx += " align=center> "+thismenu.caption+" </td>";
                            }
判断图片的位置，thismenu.pos=="3"是我自己加的代码，实现主菜单添加背景图片。

stringx += "mmenuitem_up();mexec("+x+","+i+"); ";
       if(thismenuitem.pos=="0"){
                                  stringx += "><img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+">"+ifspace+thismenuitem.caption+"</td></tr>"; 
                                }else if(thismenuitem.pos=="1"){
                                  stringx += ">"+thismenuitem.caption+ifspace+"<img align=absmiddle src='"+thismenuitem.img+"'"+imgsize+"></td></tr>"; 
                                }else if(thismenuitem.pos=="2"){
                                  stringx += "background='"+thismenuitem.img+"'>"+thismenuitem.caption+"</td></tr>"; 
                                }else{
                                  stringx += ">"+thismenuitem.caption+"</td></tr>";
                                }
     }
实现子菜单中添加图片，当构建子菜单时，最后的参数为0显示的方式是图片和文字并排存放，效果就象应用程序的菜单项中文字的标识图片一样。

顺便说明一下构建菜单项的参数：

mpmenu7=new mMenu('政策支持','','self','images/z.jpg','','','3');
mpmenu7.addItem(new mMenuItem(' 关于本系统','','self',false,'Make By－－IMUT',null,'','','',''));
new mMenu是主菜单，参数分别表示显示的文字，链接的网址，链接打开的方式，图片位置和名字，图片x的位置，图片y的，和图片摆放的位置（背景图片）。
mpmenu7.addItem(new mMenuItem(...)在mpmenu7中添加子菜单，最后一个参数为0可以实现子菜单中添加文字旁边的图片。

mmenucolor='#FFFFFF';mfontcolor='MenuText';mmenuoutcolor='#ADEF34';mmenuincolor='#B5E74E';mmenuoutbordercolor='#ECFA3A';mmenuinbordercolor='#5A2614';mmidoutcolor='#A9DA1D';mmidincolor='#799310';mmenuovercolor='#004080';mitemedge='0';msubedge='1';mmenuunitwidth=108;mmenuitemwidth=130;mmenuheight=28;mmenuwidth='100%';mmenuadjust=0;mmenuadjustV=0;mfonts='font-family: 宋体; font-size: 9pt; color: MenuText; ';mcursor='hand';
实现背景色和下拉菜单的颜色和边框颜色。

代码可以根据自己的需要来修改扩充。