var m=1;
var n=Math.floor(Math.random()*m+1);
switch(n)
{
case 1:
document.writeln("<a href=\"http:\/\/www.ad4all.net\" target=_blank><img  alt=\"中国美通广告联盟，网推网赚第一选！\" src=\"http:\/\/www.ad4all.net\/images\/logo.gif\" border=\"0\" width=\"88\" height=\"31\"><\/a>");
break;
}