function ajaxLoad(clientId, url)
{
    if (window.XMLHttpRequest)
    {// code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp=new XMLHttpRequest();
    }
    else
    {// code for IE6, IE5
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange=function()
    {
        if (xmlhttp.readyState==4 && xmlhttp.status==200)
        {
            document.getElementById(clientId).innerHTML=xmlhttp.responseText;
        }
    }
    xmlhttp.open("GET",url,true);
    xmlhttp.send();
}
function categoryLoad(url){
    url=url.replace('./index.php?mod=product', "");
    ajaxLoad("mainCenterContentDiv","./index.php?mod=category"+url);
}