Hi rohit,
Could you try the following solution, i think this is what you need.
Add Div element for Ajax loader image processing.
<div id="ajax_loader">
<img src='@Url.Content("~/Areas/images/mozilla_blu.gif")' style="padding-left:40px;" alt='' /></div>
Add javascript methods for Hide and Show in Ajax loader.
function UpdateShowPanel(UpdateMessage) {
$("#ajax_loader").show();
}
function UpdateHidePanel() {
$("#ajax_loader").hide();
}
Then Call this method where you want to show or hide. if in case you are using Update panel
just call the UpdateShow method only.