function loadRates(i) {
    document.getElementById("ajaxloader"+i).style.display = 'inline';
    var zip = document.getElementById("zip"+i).value;
    var weight = document.getElementById("weight"+i).value;
    var qty = document.getElementById("qty"+i).value;
    var url = "/GetRate.aspx?z="+zip+"&w="+weight+"&q="+qty;
    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) {
            document.getElementById("shipRateDiv"+i).innerHTML = xmlhttp.responseText;
            document.getElementById("ajaxloader"+i).style.display = 'none';
            $("#calcShipping"+i).hide("slow");
        }
    }
    xmlhttp.open("GET", url, true);
    xmlhttp.send();         
}