网页边角弹框

<SCRIPT language=JavaScript>
function CLASS_MSN_MESSAGE(id,width,height,caption,title,message,target,action)
{
this.id = id;
this.title = title;
this.caption= caption;
this.message= message;
this.target = target;
this.action = action;
this.width = width?width:200;
this.height = height?height:120;
this.timeout= 1000;
this.speed = 20;
this.step = 1;
this.right = screen.width -1;
this.bottom = screen.height;
this.left = this.right - this.width;
this.top = this.bottom - this.height;
this.timer = 0;
}

/*
* 隐藏消息方法
*/
CLASS_MSN_MESSAGE.prototype.hide = function()
{
if(this.onunload())
{
var offset = this.height>this.bottom-this.top?this.height:this.bottom-this.top;
var me = this;

if(this.timer>0)
{
window.clearInterval(me.timer);
}

var fun = function()
{
var x = me.left;
var y = 0;
var width = me.width;
var height = 0;
if(me.offset>0)
{
height = me.offset;
}

y = me.bottom - height;

if(y>=me.bottom)
{
window.clearInterval(me.timer);
me.Pop.hide();
}
else
{
me.offset = me.offset - me.step;
}
me.Pop.show(x,y,width,height);

 

}

this.timer = window.setInterval(fun,this.speed)
}
}

/*
* 消息卸载事件，可以重写
*/
CLASS_MSN_MESSAGE.prototype.onunload = function()
{
return true;
}
/*
* 消息命令事件，要实现自己的连接，请重写它
*
*/
CLASS_MSN_MESSAGE.prototype.oncommand = function(str)
{
    window.parent.mainbodyFrame.pageBody.location=str;
}

/*
* 消息显示方法
*/
CLASS_MSN_MESSAGE.prototype.show = function()
{
var oPopup = window.createPopup(); //IE5.5+

this.Pop = oPopup;

var w = this.width;
var h = this.height;

var str = "<DIV style='BORDER-RIGHT: #455690 1px solid; BORDER-TOP: #a6b4cf 1px solid; Z-INDEX: 99999; LEFT: 0px; BORDER-LEFT: #a6b4cf 1px solid; WIDTH: " + w + "px; BORDER-BOTTOM: #455690 1px solid; POSITION: absolute; TOP: 0px; HEIGHT: " + h + "px; BACKGROUND-COLOR: #c9d3f3'>"
str += "<TABLE style='BORDER-TOP: #ffffff 1px solid; BORDER-LEFT: #ffffff 1px solid' cellSpacing=0 cellPadding=0 width='100%' bgColor=#cfdef4 border=0>"
str += "<TR>"
str += "<TD style='FONT-SIZE: 12px;COLOR: #0f2c8c' width=30 height=24></TD>"
str += "<TD style='PADDING-LEFT: 4px; FONT-WEIGHT: normal; FONT-SIZE: 12px; COLOR: #1f336b; PADDING-TOP: 4px' vAlign=center width='100%'>" + this.caption + "</TD>"
str += "<TD style='PADDING-RIGHT: 2px; PADDING-TOP: 2px' vAlign=center align=right width=19>"
str += "<SPAN title=关闭 style='FONT-WEIGHT: bold; FONT-SIZE: 12px; CURSOR: hand; COLOR: red; MARGIN-RIGHT: 4px' id='btSysClose' >×</SPAN></TD>"
str += "</TR>"
str += "<TR>"
str += "<TD style='PADDING-RIGHT: 1px;PADDING-BOTTOM: 1px' colSpan=3 height=" + (h-28) + ">"
str += "<DIV style='BORDER-RIGHT: #b9c9ef 1px solid; PADDING-RIGHT: 8px; BORDER-TOP: #728eb8 1px solid; PADDING-LEFT: 8px; FONT-SIZE: 12px; PADDING-BOTTOM: 8px; BORDER-LEFT: #728eb8 1px solid; WIDTH: 100%; COLOR: #1f336b; PADDING-TOP: 8px; BORDER-BOTTOM: #b9c9ef 1px solid; HEIGHT: 100%'>" + this.title + "<BR><BR>"
str += "<DIV style='WORD-BREAK: break-all' align=left>" + this.message + "</DIV>"
str += "</DIV>"
str += "</TD>"
str += "</TR>"
str += "</TABLE>"
str += "</DIV>"

oPopup.document.body.innerHTML = str;

this.offset = 0;
var me = this;
var fun = function()
{
var x = me.left;
var y = 0;
var width = me.width;
var height = me.height;

if(me.offset>me.height)
{
height = me.height;
}
else
{
height = me.offset;
}

y = me.bottom - me.offset;
if(y<=me.top)
{
me.timeout--;
if(me.timeout==0)
{
window.clearInterval(me.timer);
me.hide();
}
}
else
{
me.offset = me.offset + me.step;
}
me.Pop.show(x,y,width,height);

 

}

this.timer = window.setInterval(fun,this.speed)

 

var btClose = oPopup.document.getElementById("btSysClose");

btClose.onclick = function()
{
me.hide();
}

var btCommand = oPopup.document.getElementById("btCommand");
btCommand.onclick = function()
{
me.oncommand(btCommand.href);
}

}
/*
** 设置速度方法
**/
CLASS_MSN_MESSAGE.prototype.speed = function(s)
{
var t = 20;
try
{
t = praseInt(s);
}
catch(e){}
this.speed = t;
}
/*
** 设置步长方法
**/
CLASS_MSN_MESSAGE.prototype.step = function(s)
{
var t = 1;
try
{
t = praseInt(s);
}
catch(e){}
this.step = t;
}

CLASS_MSN_MESSAGE.prototype.rect = function(left,right,top,bottom)
{
try
{
this.left = left !=null?left:this.right-this.width;
this.right = right !=null?right:this.left +this.width;
this.bottom = bottom!=null?(bottom>screen.height?screen.height:bottom):screen.height;
this.top = top !=null?top:this.bottom - this.height;

}
catch(e)
{}
}

function window.onload()
{
    var MSG1 = new CLASS_MSN_MESSAGE("msg",300,180,"DBOSS消息提示系统!","请点击标题查看详细内容！","<a href='#'>aaaa</a>");
     MSG1.rect(null,null,null,screen.height-50);
     MSG1.speed = 5;
     MSG1.step = 3;
     MSG1.show();
}

</SCRIPT>