18、限时广告窗口

18、限时广告窗口

<html>

<head>

<meta http-equiv="Content-Language" content="zh-cn">

<meta http-equiv="Content-Type" content="text/html; charset=gb2312">

<title>网页特效---限时广告窗口</title>

</head>

 

<body>

 

 

<style type="text/css">

<!--

#sponsorAdDiv {position:absolute; height:1; width:1; top:0; left:0;}

-->

</style>

<SCRIPT LANGUAGE="JavaScript1.2">

adTime=5;

 

chanceAd=1;

var ns=(document.layers);

var ie=(document.all);

var w3=(document.getElementById && !ie);

adCount=0;

function initAd(){

        if(!ns && !ie && !w3) return;

        if(ie)                adDiv=eval('document.all.sponsorAdDiv.style');

        else if(ns)        adDiv=eval('document.layers["sponsorAdDiv"]');

        else if(w3)        adDiv=eval('document.getElementById("sponsorAdDiv").style');

        randAd=Math.ceil(Math.random()*chanceAd);

        if (ie||w3)

        adDiv.visibility="visible";

        else

        adDiv.visibility ="show";

        if(randAd==1) showAd();

}

function showAd(){

if(adCount<adTime*10){adCount+=1;

        if (ie){documentWidth  =document.body.offsetWidth/2+document.body.scrollLeft-20;

        documentHeight =document.body.offsetHeight/2+document.body.scrollTop-20;}

        else if (ns){documentWidth=window.innerWidth/2+window.pageXOffset-20;

        documentHeight=window.innerHeight/2+window.pageYOffset-20;}

        else if (w3){documentWidth=self.innerWidth/2+window.pageXOffset-20;

        documentHeight=self.innerHeight/2+window.pageYOffset-20;}

        adDiv.left=documentWidth-200;adDiv.top =documentHeight-200;

        setTimeout("showAd()",100);}else closeAd();

}

function closeAd(){

if (ie||w3)

adDiv.display="none";

else

adDiv.visibility ="hide";

}

onload=initAd;

</script>

<div id="sponsorAdDiv" style="visibility:hidden">

<table width="450" height="350" bgcolor="008000"><tr><td>

<table width="445" height="345" bgcolor="F0FFF0"><tr><td>

欢迎光临网页特效 网络因你而精彩!<p> </p>

<p><span lang="zh-cn">进入页面时出现一个窗口,本例显示的时间为5</span></td></tr></table></td></tr></table></div>

 

</body>

 

</html>

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