function ajaxStockDropBox(prefix, val, prodid){
var ajaxRequest;
    try{
        ajaxRequest=new XMLHttpRequest();
    }
    catch(e){
        try{
            ajaxRequest=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch(e){
            try{
                ajaxRequest=new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(e){
                alert("This function requires the use of Javascript. Please enable Javascript from the Tools menu of your web browser. We apologize for any inconvenience.");
                return false;
            }
        }
    }
    ajaxRequest.onreadystatechange=function(){
        if(ajaxRequest.readyState==4&&ajaxRequest.status==200){
            document.getElementById('stockdropbox').innerHTML=ajaxRequest.responseText;
        }
        if(ajaxRequest.readyState!=4){
            document.getElementById("stockdropbox").innerHTML='';
        }
    }

    var queryString="?selectedsize="+val+"&prod_id="+prodid+"&rannum="+Math.random();
    ajaxRequest.open("GET", "http://redlane.ie/updatestockdropbox.php"+queryString,true);
    ajaxRequest.send(null);
}