演示效果：

<SCRIPT language=javascript>
var webSiteID = 6;window.onload = enetgetMsg;
window.onresize = enetresizeDiv;
window.onerror = function(){}
var enetdivTop,enetdivLeft,enetdivWidth,enetdivHeight,enetdocHeight,enetdocWidth,enetobjTimer,i = 0;
function enetgetMsg()
{
try{
enetdivTop = parseInt(document.getElementById("enetMeng").style.top,10)
enetdivLeft = parseInt(document.getElementById("enetMeng").style.left,10)
enetdivHeight = parseInt(document.getElementById("enetMeng").offsetHeight,10)
enetdivWidth = parseInt(document.getElementById("enetMeng").offsetWidth,10)
enetdocWidth = document.body.clientWidth;
enetdocHeight = document.body.clientHeight;
document.getElementById("enetMeng").style.top = parseInt(document.body.scrollTop,10) + enetdocHeight + 10;// enetdivHeight
document.getElementById("enetMeng").style.left = parseInt(document.body.scrollLeft,10) + enetdocWidth - enetdivWidth
document.getElementById("enetMeng").style.visibility="visible"
enetobjTimer = window.setInterval("enetmoveDiv()",10)
}
catch(e){}
}
　
function enetresizeDiv()
{
i+=1
if(i>800) enetcloseDiv() /自动关闭时间
try{
enetdivHeight = parseInt(document.getElementById("enetMeng").offsetHeight,10)
enetdivWidth = parseInt(document.getElementById("enetMeng").offsetWidth,10)
enetdocWidth = document.body.clientWidth;
enetdocHeight = document.body.clientHeight;
document.getElementById("enetMeng").style.top = enetdocHeight - enetdivHeight + parseInt(document.body.scrollTop,10)
document.getElementById("enetMeng").style.left = enetdocWidth - enetdivWidth + parseInt(document.body.scrollLeft,10)
}
catch(e){}
}
function enetmoveDiv()
{
try
{
if(parseInt(document.getElementById("enetMeng").style.top,10) <= (enetdocHeight - enetdivHeight + parseInt(document.body.scrollTop,10)))
{
window.clearInterval(enetobjTimer)
enetobjTimer = window.setInterval("enetresizeDiv()",1)
}
enetdivTop = parseInt(document.getElementById("enetMeng").style.top,10)
document.getElementById("enetMeng").style.top = enetdivTop - 1
}
catch(e){}
}
function enetcloseDiv()
{
document.getElementById('enetMeng').style.visibility='hidden';
if(enetobjTimer) window.clearInterval(enetobjTimer)
}
</SCRIPT>
<DIV id=enetMeng
#455690 1px solid; BORDER-TOP: #a6b4cf 1px solid; Z-INDEX: 99999; LEFT: 0px; VISIBILITY: visible; BORDER-LEFT: #a6b4cf 1px solid; 1px solid; POSITION: absolute; TOP: -256px; HEIGHT: 157px">
<a href="连接地址"><img src="图片地址" border="0"></a>
</div>