!--全屏开始--!--interstitial begin--
      SCRIPT language=JavaScript 
!--
//时间计算
SYfullscreen=false;
today=new Date();
function testdate()
{
    if(today.getMonth()=='2') //是否为3月
        {
            if(today.getDate()=='15') //是否为15日
            {
!--725A3E8355CB--//全屏开始
if(today.getHours()='14' && today.getHours()'15')
{    
    adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html?
http://sina.allyes.com/main/adfclick?
db=sina&bid=73474,105318,105433&cid=0,0,0&sid=97875&advid=3716&camid=14291&show=ignore&url=http://61.49.38.5/tzhddoc/index.ht
m${}/upload/2007315152115702.jpg';SYfullscreen=true                                

}!--$$ huiyan/2007-3-15 14:00:01 ~ 2007-3-15 14:59:59/B $--
!--4774607C08FD--//全屏开始
if(today.getHours()='8' && today.getHours()'9')
{    
    adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html?
http://sina.allyes.com/main/adfclick?
db=sina&bid=73474,105318,105433&cid=0,0,0&sid=97875&advid=3716&camid=14291&show=ignore&url=http://61.49.38.5/tzhddoc/index.ht
m${}/upload/2007315152115903.JPG';SYfullscreen=true                            

}!--$$ raowei/2007-3-15 ~ 2007-3-16 两天勿撤，谢谢！/B $--
!--35F6B37FB5E4--//全屏开始
if(today.getHours()='16' && today.getHours()'17')
{    
    adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html?
http://sina.allyes.com/main/adfclick?
db=sina&bid=70483,101960,102064&cid=0,0,0&sid=94712&advid=3254&camid=13506&show=ignore&url=http://www.sagitar.com.cn/${}
/upload/2007315152115985.GIF';SYfullscreen=true                    

}!--$$ limeng/2007-3-15 16:00:01 ~ 2007-3-15 16:59:59/B $--
!--C5EB1D51E54C--//全屏开始
if(today.getHours()='17' && today.getHours()'18')
{    
    adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html?
http://sina.allyes.com/main/adfclick?
db=sina&bid=73214,104975,105088&cid=0,0,0&sid=97562&advid=3705&camid=14237&show=ignore&url=http://adclient.dentsu.com.cn/html
.ng/adspec=Flash&adtype=single_dui_lian&affiliate=sina&campaignid=842&channel=aoyun_page&log=0¶ms.styles=clickcmd?${}
/upload/2007315152115273.jpg';SYfullscreen=true                    

}!--$$ limeng/2007-3-15 17:00:01 ~ 2007-3-15 17:59:59/B $--
!--D4C112442CAF--//全屏开始
if(today.getHours()='18' && today.getHours()'19')
{    
    adInterPath='http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html?
http://sina.allyes.com/main/adfclick?
db=sina&bid=73271,105059,105175&cid=0,0,0&sid=97643&advid=3254&camid=14234&show=ignore&url=http://www.sagitar.com.cn/olympic$
{}/upload/2007315152115162.jpg';SYfullscreen=true                

}!--$$ limeng/2007-3-15 ~ 2007-3-15/B $--
}}}
testdate();
var MSIE=navigator.userAgent.indexOf("MSIE");
var OPER=navigator.userAgent.indexOf("Opera");
if(SYfullscreen==true)
{
    if (document.all && MSIE!=-1 && OPER==-1) { 
    // this is a 4.x browser, no? 
function changediv(){
    document.getElementById('hiddenLayer').style.display = "block";
    document.getElementById('interstitialFrame').src = adInterPath;
    setTimeout("hidediv()",5000)
}
function hidediv(){
    document.getElementById('hiddenLayer').style.display="none";
    SYtag=2;
}
function showfull(){
    setTimeout("changediv()",2000); 
}
showfull();
    }
}
// --
/SCRIPT
      SCRIPT language=JavaScript 
!--
if(SYfullscreen==true)
{
    if (document.all && MSIE!=-1 && OPER==-1) { 
    // this is a 4.x browser, no? 
        document.write('DIV ID="hiddenLayer" style="display: none; height: 450px;"');

        expandableIframe = 'IFRAME id="interstitialframe" width=750 HEIGHT=450 NORESIZE SCROLLING=No FRAMEBORDER=0 
MARGINHEIGHT=0 MARGINWIDTH=0/IFRAME';
        document.write(expandableIframe);

}
document.write('/div');
}
// --
/SCRIPT
!--interstitial end--!--全屏结束--
说明新浪主要是根据时间段来显示不同的广告,然后将动态控制iframe来显示广告
有个重要的文件
http://ad4.sina.com.cn/sina/ae/ad_src/fullscreen/fullscreenv2.html
的代码如下,用${}作为分割符,利用了数组
代码如下：

htmlhead
meta http-equiv="Content-type" content="text/html; charset=gb2312"
title新浪广告/title
/head
body bgcolor=#ffffff topmargin=0 marginheight=0 leftmargin=0 marginwidth=0
center
script language = javascript
var par = location.search.substr(1);
var ary = par.split("${}");

document.writeln("a href='"  + ary[0] + "' target=_blankimg src=" + ary[1] + " width=750 height=450 border=0/a");
/script
/center
/body/html

ary[0]为连接地址
ary[1]为图片地址