If you look at the source of your page after the gridview is added, search for your control name and grab the entire ID. This is the part that goes as a parameter of the quicksearch function, like so:
<script type="text/javascript">Note that I change the "table#tableName tbody tr" that most jQuery quicksearch examples use into "table#tableName tbody .tableRow", which is a css class I plan to add to each of my rows. If I didn't do this, I would be loosing my header row when the filter fired. To choose the CSS class of the rows in the gridview, use this line within the gridview:
$(function () {
$('input#id_search').quicksearch('table#ctl00_MainContent_UserRoles_gvUserRoles tbody .UserRolesRow');
});
</script>
<RowStyle CssClass="UserRolesRow" />Check out a full file example here, and good luck in your endeavors.