IE6  PNG 透明

JS文件-----------------------------------

var DD_belatedPNG = {
 ns: 'DD_belatedPNG',
 imgSize: {},
 delay: 10,
 nodesFixed: 0,
 createVmlNameSpace: function () {
  if (document.namespaces&& !document.namespaces[this.ns]){
   document.namespaces.add(this.ns,'urn:schemas-microsoft-com:vml');
  }
 },
 createVmlStyleSheet: function () {
  
  var screenStyleSheet,printStyleSheet;
  screenStyleSheet =document.createElement_x('style');
  screenStyleSheet.setAttribute('media','screen');
  document.documentElement.firstChild.insertBefore(screenStyleSheet,document.documentElement.firstChild.firstChild);
  if(screenStyleSheet.styleSheet) {
   screenStyleSheet= screenStyleSheet.styleSheet;
   screenStyleSheet.addRule(this.ns+ '\\:*', '{behavior:url(#default#VML)}');
   screenStyleSheet.addRule(this.ns+ '\\:shape', 'position:absolute;');
   screenStyleSheet.addRule('img.'+ this.ns + '_sizeFinder', 'behavior:none; border:none;position:absolute; z-index:-1; top:-10000px;visibility:hidden;');
   this.screenStyleSheet= screenStyleSheet;
   
   
   
   printStyleSheet= document.createElement_x('style');
   printStyleSheet.setAttribute('media','print');
   document.documentElement.firstChild.insertBefore(printStyleSheet,document.documentElement.firstChild.firstChild);
   printStyleSheet= printStyleSheet.styleSheet;
   printStyleSheet.addRule(this.ns+ '\\:*', '{display: none !important;}');
   printStyleSheet.addRule('img.'+ this.ns + '_sizeFinder', '{display: none !important;}');
  }
 },
 readPropertyChange: function () {
  var el, display, v;
  el = event.srcElement;
  if (!el.vmlInitiated) {
   return;
  }
  if(event.propertyName.search('background') != -1 ||event.propertyName.search('border') != -1) {
   DD_belatedPNG.applyVML(el);
  }
  if (event.propertyName =='style.display') {
   display =(el.currentStyle.display == 'none') ? 'none' : 'block';
   for (v inel.vml) {
    if(el.vml.hasOwnProperty(v)) {
     el.vml[v].shape.style.display= display;
    }
   }
  }
  if(event.propertyName.search('filter') != -1) {
   DD_belatedPNG.vmlOpacity(el);
  }
 },
 vmlOpacity: function (el) {
  if(el.currentStyle.filter.search('lpha') != -1) {
   var trans =el.currentStyle.filter;
   trans =parseInt(trans.substring(trans.lastIndexOf('=')+1,trans.lastIndexOf(')')), 10)/100;
   el.vml.color.shape.style.filter= el.currentStyle.filter;
   el.vml.image.fill.opacity= trans;
  }
 },
 handlePseudoHover: function (el) {
  setTimeout(function () {
   DD_belatedPNG.applyVML(el);
  }, 1);
 },
 
 fix: function (selector) {
  if (this.screenStyleSheet){
   varselectors, i;
   selectors =selector.split(',');
   for (i=0;i<selectors.length; i++) {
    this.screenStyleSheet.addRule(selectors[i],'behavior:expression_r(DD_belatedPNG.fixPng(this))');
   }
  }
 },
 applyVML: function (el) {
  el.runtimeStyle.cssText ='';
  this.vmlFill(el);
  this.vmlOffsets(el);
  this.vmlOpacity(el);
  if (el.isImg) {
   this.copyImageBorders(el);
  }
 },
 attachHandlers: function (el) {
  var self, handlers, handler,moreForAs, a, h;
  self = this;
  handlers = {resize:'vmlOffsets', move: 'vmlOffsets'};
  if (el.nodeName == 'A') {
   moreForAs ={mouseleave: 'handlePseudoHover', mouseenter: 'handlePseudoHover',focus: 'handlePseudoHover', blur: 'handlePseudoHover'};
   for (a inmoreForAs){   
    if(moreForAs.hasOwnProperty(a)) {
     handlers[a]= moreForAs[a];
    }
   }
  }
  for (h in handlers) {
   if(handlers.hasOwnProperty(h)) {
    handler= function () {
     self[handlers[h]](el);
    };
    el.attachEvent('on'+ h, handler);
   }
  }
  el.attachEvent('onpropertychange',this.readPropertyChange);
 },
 giveLayout: function (el) {
  el.style.zoom = 1;
  if (el.currentStyle.position =='static') {
   el.style.position= 'relative';
  }
 },
 copyImageBorders: function (el) {
  var styles, s;
  styles = {'borderStyle':true,'borderWidth':true, 'borderColor':true};
  for (s in styles) {
   if(styles.hasOwnProperty(s)) {
    el.vml.color.shape.style[s]= el.currentStyle[s];
   }
  }
 },
 vmlFill: function (el) {
  if (!el.currentStyle) {
   return;
  } else {
   var elStyle,noImg, lib, v, img, imgLoaded;
   elStyle =el.currentStyle;
  }
  for (v in el.vml) {
   if(el.vml.hasOwnProperty(v)) {
    el.vml[v].shape.style.zIndex= elStyle.zIndex;
   }
  }
  el.runtimeStyle.backgroundColor= '';
  el.runtimeStyle.backgroundImage= '';
  noImg = true;
  if (elStyle.backgroundImage !='none' || el.isImg) {
   if(!el.isImg) {
    el.vmlBg= elStyle.backgroundImage;
    el.vmlBg= el.vmlBg.substr(5, el.vmlBg.lastIndexOf('")')-5);
   }
   else {
    el.vmlBg= el.src;
   }
   lib =this;
   if(!lib.imgSize[el.vmlBg]) {
    img= document.createElement_x('img');
    lib.imgSize[el.vmlBg]= img;
    img.className= lib.ns + '_sizeFinder';
    img.runtimeStyle.cssText= 'behavior:none; position:absolute; left:-10000px; top:-10000px;border:none; margin:0; padding:0;';
    imgLoaded= function () {
     this.width= this.offsetWidth;
     this.height= this.offsetHeight;
     lib.vmlOffsets(el);
    };
    img.attachEvent('onload',imgLoaded);
    img.src= el.vmlBg;
    img.removeAttribute('width');
    img.removeAttribute('height');
    document.body.insertBefore(img,document.body.firstChild);
   }
   el.vml.image.fill.src= el.vmlBg;
   noImg =false;
  }
  el.vml.image.fill.on =!noImg;
  el.vml.image.fill.color ='none';
  el.vml.color.shape.style.backgroundColor= elStyle.backgroundColor;
  el.runtimeStyle.backgroundImage= 'none';
  el.runtimeStyle.backgroundColor= 'transparent';
 },
 
 vmlOffsets: function (el) {
  var thisStyle, size, fudge,makeVisible, bg, bgR, dC, altC, b, c, v;
  thisStyle =el.currentStyle;
  size = {'W':el.clientWidth+1,'H':el.clientHeight+1, 'w':this.imgSize[el.vmlBg].width,'h':this.imgSize[el.vmlBg].height, 'L':el.offsetLeft,'T':el.offsetTop, 'bLW':el.clientLeft, 'bTW':el.clientTop};
  fudge = (size.L + size.bLW ==1) ? 1 : 0;
  
  makeVisible = function (vml, l,t, w, h, o) {
   vml.coordsize= w+','+h;
   vml.coordorigin= o+','+o;
   vml.path ='m0,0l'+w+',0l'+w+','+h+'l0,'+h+' xe';
   vml.style.width= w + 'px';
   vml.style.height= h + 'px';
   vml.style.left= l + 'px';
   vml.style.top= t + 'px';
  };
  makeVisible(el.vml.color.shape,(size.L + (el.isImg ? 0 : size.bLW)), (size.T + (el.isImg ? 0 :size.bTW)), (size.W-1), (size.H-1), 0);
  makeVisible(el.vml.image.shape,(size.L + size.bLW), (size.T + size.bTW), (size.W), (size.H), 1);
  bg = {'X':0, 'Y':0};
  if (el.isImg) {
   bg.X =parseInt(thisStyle.paddingLeft, 10) + 1;
   bg.Y =parseInt(thisStyle.paddingTop, 10) + 1;
  }
  else {
   for (b in bg){
    if(bg.hasOwnProperty(b)) {
     this.figurePercentage(bg,size, b, thisStyle['backgroundPosition'+b]);
    }
   }
  }
  el.vml.image.fill.position =(bg.X/size.W) + ',' + (bg.Y/size.H);
  bgR =thisStyle.backgroundRepeat;
  dC = {'T':1, 'R':size.W+fudge,'B':size.H, 'L':1+fudge};
  altC = { 'X': {'b1': 'L', 'b2':'R', 'd': 'W'}, 'Y': {'b1': 'T', 'b2': 'B', 'd': 'H'} };
  if (bgR != 'repeat' ||el.isImg) {
   c ={'T':(bg.Y), 'R':(bg.X+size.w), 'B':(bg.Y+size.h),'L':(bg.X)};
   if(bgR.search('repeat-') != -1) {
    v= bgR.split('repeat-')[1].toUpperCase();
    c[altC[v].b1]= 1;
    c[altC[v].b2]= size[altC[v].d];
   }
   if (c.B> size.H) {
    c.B= size.H;
   }
   el.vml.image.shape.style.clip= 'rect('+c.T+'px '+(c.R+fudge)+'px '+c.B+'px'+(c.L+fudge)+'px)';
  }
  else {
   el.vml.image.shape.style.clip= 'rect('+dC.T+'px '+dC.R+'px '+dC.B+'px '+dC.L+'px)';
  }
 },
 figurePercentage: function (bg, size, axis,position) {
  var horizontal, fraction;
  fraction = true;
  horizontal = (axis =='X');
  switch(position) {
   case'left':
   case'top':
    bg[axis]= 0;
    break;
   case'center':
    bg[axis]= 0.5;
    break;
   case'right':
   case'bottom':
    bg[axis]= 1;
    break;
   default:
    if(position.search('%') != -1) {
     bg[axis]= parseInt(position, 10) / 100;
    }
    else{
     fraction= false;
    }
  }
  bg[axis] =Math.ceil(  fraction ? ( (size[horizontal?'W':'H'] * bg[axis]) - (size[horizontal?'w': 'h'] * bg[axis]) ) :parseInt(position, 10)  );
  if (bg[axis] % 2 === 0) {
   bg[axis]++;
  }
  return bg[axis];
 },
 fixPng: function (el) {
  el.style.behavior ='none';
  var lib, els, nodeStr, v,e;
  if (el.nodeName == 'BODY' ||el.nodeName == 'TD' || el.nodeName == 'TR') {
   return;
  }
  el.isImg = false;
  if (el.nodeName == 'IMG'){
   if(el.src.toLowerCase().search(/\.png$/)!= -1) {
    el.isImg= true;
    el.style.visibility= 'hidden';
   }
   else {
    return;
   }
  }
  else if(el.currentStyle.backgroundImage.toLowerCase().search('.png') ==-1) {
   return;
  }
  lib = DD_belatedPNG;
  el.vml = {color: {}, image:{}};
  els = {shape: {}, fill:{}};
  for (v in el.vml) {
   if(el.vml.hasOwnProperty(v)) {
    for(e in els) {
     if(els.hasOwnProperty(e)) {
      nodeStr= lib.ns + ':' + e;
      el.vml[v][e]= document.createElement_x(nodeStr);
     }
    }
    el.vml[v].shape.stroked= false;
    el.vml[v].shape.appendChild(el.vml[v].fill);
    el.parentNode.insertBefore(el.vml[v].shape,el);
   }
  }
  el.vml.image.shape.fillcolor ='none';
  el.vml.image.fill.type ='tile';
  el.vml.color.fill.on =false;
  lib.attachHandlers(el);
  lib.giveLayout(el);
  lib.giveLayout(el.offsetParent);
  el.vmlInitiated = true;
  lib.applyVML(el);
 }
};
try {
 document.execCommand("BackgroundImageCache",false, true);
} catch(r) {}
DD_belatedPNG.createVmlNameSpace();
DD_belatedPNG.createVmlStyleSheet();

 

网页文件----------------------------

<script src="js/DD_belatedPNG_0.0.8a.js"type="text/javascript"></script>
<script type="text/javascript">
 DD_belatedPNG.fix('div, ul, img, li, input ,a');
</script>