function getBakcurl()
{
	var locationhref = decodeURIComponent(window.location.href);
	//alert(locationhref);
	var startpos = locationhref.indexOf("?");
	var endpos = locationhref.lastIndexOf("?");
	var backurl;
	var vipsum = '';
	if(startpos == -1)
	{
		backurl = 'http://nba.tom.com/pass/index.html';
	}else{
		backurl = locationhref.substring(startpos + 9);
		if(backurl.indexOf('backurl') != -1){
			var backurl2 = backurl.split("backurl=");
			backurl = backurl2[0] + "backurl=" + encodeURIComponent(backurl2[1]);
		}
		//backurl = locationhref.split("backurl=");
	}
//	for(var i = 1; i < pieces.length; i++)
//	{
//		var vip = encodeURI(pieces[i]);
//		vipsum = vipsum + vip;
//	}
//	backurl = pieces[0] + '=' + encodeURI(pieces[1]);
	//backurl=encodeURI(backurl);
	return backurl;
}