function passVars(form) 
{ 
    var name_value = form.name.value; 
    var email_value = form.Email1.value; 
   
    if(typeof form.Zip == 'undefined')
        var zip_value = ''
    else 
        var zip_value = form.Zip.value;
        var ref_value = form.ref.value;
        var landing_value = form.landing.value;
        var thankyou = form.ARThankyouURL.value;
        thankyou += "?name=" + name_value + "&email=" + email_value + "&ref=" + ref_value + "&landing=" + landing_value + "&zip=" + zip_value + "&ip=96.253.80.141";


        form.ARThankyouURL.value = thankyou; 
 }