var stat_style = '';
var stat_url = 'http://www.purchase.gov.cn/stat';
<!--var stat_referrer = escape(document.referrer);-->
<!--var stat_referrer = encodeURI(document.referrer);-->
<!-- var stat_referrer = document.referrer; -->
var stat_referrer = '';
var stat_add	= '<script language=javascript src=' + stat_url 
			  + '/statadd.php?user_ad=' + stat_referrer
			  + '&style=' + stat_style
			  + '><\/script>';
document.write(stat_add);