if(document.referrer.indexOf('google') == -1){
	
}else{
	document.writeln('<link rel="stylesheet" href="/exit.css" />');
	document.writeln('<script type="text/javascript" src="/exit.js"></script>');
	
	ref = document.referrer;
	exp = new Date();
	exp.setTime(exp.getTime() + (1000 * 60 * 60 * 24 * 30));
	expires = exp;
	document.cookie = "provabingo_ref" + "=" + escape(ref) + "; path=/" + ((expires == null) ? "" : "; expires=" + expires.toGMTString());
}