Jquery Loader Closing

From my ASP.Net application Using Jquery I am trying to load a gif image to show the progress while waiting for a grid to appear from the co开发者_Go百科de behind. I am using a dialog box for this. But the problem is that when to close this dialog box. Is there any event which is automatically fired when a code behind function is executed?

    $("#divloadwait").dialog({

        autoOpen: false,
        modal: false,
        height: 10,
        width: 10,
        resizable: false


    });

})

function ShowGroup() {

    $("#divGroup").dialog("open");
    showLoadWait();
}

The divGroup dialog box has iframe which has src pointed to another form.