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上面的放在body下面其中有一个外部引用的js文件，

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var ads_agt=navigator.userAgent.toLowerCase();

var ads_is_major = parseInt(navigator.appVersion);

var ads_is_ie = ((ads_agt.indexOf("msie") != -1) && (ads_agt.indexOf("opera") == -1) && (ads_agt.indexOf("omniweb") == -1));

var ads_is_ie3 = (ads_is_ie && (ads_is_major = 4));

var ads_is_ie5 = (ads_is_ie && (ads_is_major == 4) && (ads_agt.indexOf("msie 5.0")!=-1) );

var ads_is_ie5up = (ads_is_ie && !ads_is_ie3 && !ads_is_ie4);

var ads_is_ie5_1_macbeta = (ads_is_ie && (ads_agt.indexOf("mac")!=-1) && (ads_agt.indexOf("5.1b")!=-1));

var ads_is_nav = ((ads_agt.indexOf('mozilla')!=-1) && (ads_agt.indexOf('spoofer')==-1)

&& (ads_agt.indexOf('compatible') == -1) && (ads_agt.indexOf('opera')==-1)

&& (ads_agt.indexOf('webtv')==-1));

var ads_is_nav6 = (ads_is_nav && (ads_agt.indexOf("netscape6")!=-1) && (ads_agt.indexOf("6.1")==-1));

var ads_is_nav6up = (ads_is_nav && !ads_is_nav4 && !ads_is_nav3 && !ads_is_nav2);

var ads_is_nav6_1 = (ads_is_nav && (ads_agt.indexOf("netscape6")!=-1) && (ads_agt.indexOf("6.1")!=-1));

var ads_is_nav6_1up = (ads_is_nav && !ads_is_nav6 && !ads_is_nav4 && !ads_is_nav3 && !ads_is_nav2);

getsGlu = ((ads_is_ie5up && !ads_is_ie5_1_macbeta) || ads_is_nav6_1up);

//function changediv(depth)

//{

// divAll.style.zIndex=depth

// }

function changediv()

{

document.getElementById('hiddenLayer').style.display = "block";

document.getElementById('interstitialFrame').src = adInterPath;

setTimeout("hidediv()",10000)

}

function hidediv()

{

document.getElementById('hiddenLayer').style.display="none";

SYtag=2;

}

function showfull()

{

setTimeout("changediv()",3000);

}

showfull()

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js文件内容