var requrl = '404;http://www.ss256.com:80/html/Jiaoyu_Peixun/doule_net.html';
var start = requrl.lastIndexOf("/") + 1;
var end = requrl.indexOf("?");
requrl=requrl.substring(start,end);

if(requrl.indexOf("404") == 0)
	document.location="http://ent.sogua.com";

var curl = document.location.href.substring(7);
var tPos = curl.indexOf("/");
if(tPos > -1)	curl = curl.substring(0, tPos);

if(requrl == curl + ".asp")
	document.location="http://ent.sogua.com";