function RecordFrom(){
    var strCookie=document.cookie;
    var arrCookie=strCookie.split(";");
    
    var re=/prev=(.+)/;
    
    for(var i=0;i<arrCookie.length;i++){
        if(arrCookie[i].match(re)){
            return;
        }
        else{
            continue;
        }
    }
	var date = new Date();
	date.setTime(date.getTime()+3600*1000*24*7);
    if(document.referrer.length>0){
        document.cookie="prev="+document.referrer+";domain=.carsfun.com;path=/;expires="+date.toGMTString();}
    else{
        document.cookie="prev="+window.location+";domain=.carsfun.com;path=/;expires="+date.toGMTString();}
}
RecordFrom();