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{
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color : #1A6841;
left:expression(eval(document.body.clientWidth)/2-150);
top:expression(eval(document.body.clientHeight)/2-25);
width:300px;
height:50px;
border:green 1px solid;
background:#99CCFF;
+position:absolute;
+left:expression(eval(document.body.scrollLeft)+eval(document.body.clientWidth)/2-150);
+top:expression(eval(document.body.scrollTop)+eval(document.body.clientHeight)/2-25);
}
ÍøÒ³¿É¼ûÇøÓò¿í£ºdocument.body.clientWidth
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ÍøÒ³ÕýÎÄÈ«Îĸߣºdocument.body.scrollHeight
ÍøÒ³±»¾íÈ¥µÄ¸ß£ºdocument.body.scrollTop
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</tr>
</table>
<script type="text/javascript" src="Maple_Couplet.Js"></script>
<script type="text/javascript">
window.onload = function(){
   n=window.screen.height; //ÆÁÄ»µÄ·Ö±æÂÊ
   m=window.screenTop;   //ÍøÒ³ÄÚÈݾàÆÁÄ»¶¥²¿µÄ¾àÀë ¼´ IE°´Å¥£¬µØÖ·À¸µÈµÄ¸ß¶È
   myBottom=n-m-30-50; //n-m-ÏÔʾDivµÄ¸ß-µ×²¿×´Ì¬À¸ºÍÈÎÎñÀ¸µÄ¸ßÔ¼50
   //aa.innerHTML=m;
        new couplet("maple1",myBottom,40);
}
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<SCRIPT language="JavaScript" type="text/javascript">
function openmu() {
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