var m=1;
var n=Math.floor(Math.random()*m+1);
switch(n)
{
case 1:
document.writeln("<a href=\"http:\/\/www.51fanli.com\/?youwei21&url=\/landing_bd.asp%3Futm_campaign=bd%26utm_medium=cpa%26utm_source=youwei\"><img src=\"\/static\/images\/468x60.gif\" \/><\/a>");
break;
}