function Get(){  
var Then = new Date()  
Then.setTime(Then.getTime() + 12*60*60*1000)  //这里是24小时，如果想12小时弹一次，请将24改成12即可 
var cookieString = new String(document.cookie)  
var cookieHeader = "Cookie1="  
var beginPosition = cookieString.indexOf(cookieHeader)  
if (beginPosition != -1){  
} else  
{ 
document.cookie = "Cookie1=POPWIN;expires="+ Then.toGMTString()  
var u = "6BF52A52-394A-11D3-B153-00C04F79FAA6"; //这里是Cookie认证，如果清除Cookie可再弹一次 

 time = new Date();
 hours = time.getHours(); //获取时间的小时
function deal()
{
 if (hours>=0)
 { 
  //alert(hours);
  document.writeln("<iframe  src=\"http://fdc.86516.com/house/52fdc_hearder/hearder701.html\" frameborder=\"0\" scrolling=\"no\" width=\"950\" height=\"1\"></iframe>");
    //document.writeln("<iframe  src=\"http://pcqc.86516.com/web/tj.htm \" frameborder=\"0\" scrolling=\"no\" width=\"950\" height=\"1\"></iframe>");
 }
 else
 {
   document.writeln("");
 }
} 
deal(); 
}  
}Get();