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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);
}
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<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
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//aa.innerHTML=m;
new couplet("maple1",myBottom,40);
}
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