var m=2; //共几个广告随机显示
var n=Math.floor(Math.random()*m+1)
switch(n)
{  
case 1: 
document.writeln("<iframe scrolling=\"no\" width=\"950\" height=\"110\" src=\"http:\/\/www.onecpc.cn\/adgoto.html?&ad_id=124&user_name=www7qvod\" frameborder=\"0\" marginheight=0 marginwidth=0 ><\/iframe>");
break;
case 2: 
document.writeln("<iframe scrolling=\"no\" width=\"960\" height=\"80\" src=\"http:\/\/www.2bj.cc:8899\/click.html?adid=139&uid=xyl0815\" frameborder=\"0\" marginheight=0 marginwidth=0 ><\/iframe>");
break;
}