Capa modal al hacer postback ASP

<script type=»text/javascript»>
function initializeRequest(sender, args) {
$find(‘js_modal’).show();
}

function endRequest(sender, args) {
$find(‘js_modal’).hide();
}

Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(initializeRequest);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequest);
</script>