var stat_url = 'http://www.91xuexi.com';
var filename = '';
var stat_referrer = escape(document.referrer);
var stat_add	= '<script language=javascript src=' + stat_url 
			  + '/ip.php?user_ad=' + stat_referrer
			  + '&filename=' + filename
			  + '><\/script>';
document.write(stat_add);