function addclick(hull) {
    var request;
    if (window.XMLHttpRequest){   // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp=new XMLHttpRequest();
    }
    else {// code for IE6, IE5
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    request=new XMLHttpRequest();
    request.open("GET","/admin/update_clicks.php?hull=" + hull,true);
    request.send();
}