层问题
很多网站的首页，都有一张小小的广告图片跟随着滚动条，怎么做的，谢谢！ 问题点数：20、回复次数：1Top
1 楼lienzhu（李强）回复于 2004-12-04 00:11:53 得分 20
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<DIV id=ad1 style="Z-INDEX: 1002; LEFT: 3px; POSITION: absolute; TOP: 20px">
<IMG src="http://www.liaoba.com/images/ad1.gif" width=134 height="156" useMap=#Map2 border=0>
</DIV>
<SCRIPT language=JavaScript>
<!--
self.onError=null;
currentX = currentY = 0;
whichIt = null;
var action;
lastScrollX = 0; lastScrollY = 0;
NS = (document.layers) ? 1 : 0;
IE = (document.all) ? 1: 0;
function heartBeat() {
if(IE) { diffY = document.body.scrollTop; diffX = document.body.scrollLeft; }
if(NS) { diffY = self.pageYOffset; diffX = self.pageXOffset; }
if(diffY != lastScrollY) {
percent = .1 * (diffY - lastScrollY);
if(percent > 0) percent = Math.ceil(percent);
else percent = Math.floor(percent);
if(IE) document.all.ad1.style.pixelTop += percent;
if(NS) document.ad1.top += percent;
lastScrollY = lastScrollY + percent;
}
if(diffX != lastScrollX) {
percent = .1 * (diffX - lastScrollX);
if(percent > 0) percent = Math.ceil(percent);
else percent = Math.floor(percent);
if(IE) document.all.floater.style.pixelLeft += percent;
if(NS) document.floater.left += percent;
lastScrollX = lastScrollX + percent;
}
}
action1 = window.setInterval("heartBeat()",1);
-->
</SCRIPT>
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