Waiting Image and Download popup not appering when request send from ajax model popup which is present inside Update panel ?

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Ajax

Hii ,


I have one Ajax model popup which is present inside , from this popup , i can download multiple contents and give the download popup to user ,

previously i wasnt keeping update panel but now i wanted to display waiting image if there is processing time to download the content on page , but image not coming as well as not even that download popup is coming on the page

Please suggest

function BeginRequestHandler(sender, args) {
        var elem = args.get_postBackElement();
        $("body").css("overflow", "hidden");
        ActivateAlertDiv('visible', 'AlertDivContainer');
    }

    function EndRequestHandler(sender, args) {
        DeActivateAlertDiv('hidden', 'AlertDivContainer');
        $("body").css("overflow", "auto");
    }

    function ActivateAlertDiv(visstring, elem) {
        var adiv = $get(elem);
        adiv.style.visibility = visstring;
    }

    function DeActivateAlertDiv(visstring, elem) {
        var adiv = $get(elem);
        adiv.style.visibility = visstring;
    }

<div id="AlertDivContainer" class="AlertStyleContainer">
    <div id="AlertDivContent" class="AlertStyleContent">
        <img src="../images/loading.gif" alt=" " />
    </div>
</div>

this is my content to disply processing image