var s = "http://www.21cn.com/bbs/3/3/3/3/3/3/3.jpeke?eee%fff&fff";
var n = s.replace(/^http:\/\/+/i, "");
var sum=n.replace(/\/[a-zA-Z0-9\/\.\%\&\?]+/,"")
alert (sum);
UrlString="http://aaaaexpert.csdn.net/Expert/PostNew.asp?room=133"
function CutUrl(UrlString)
UrlString=mid(UrlString,Instr(UrlString,"//")+2,len(UrlString)-Instr(UrlString,"//")-1)
UrlString=mid(UrlString,1,Instr(UrlString,"/")-1)
CutUrl=UrlString
end function