I have a case where I need to update a jqgrid based on some search criteria which the user selects. I can get the data to update , but I would want the loading message to show while the new data is being fetched. Can someone please let me know how to get that working ?

Current code follows

var ob_gridContents = $.ajax( {
 url : '/DisplayObAnalysisResults.action?getCustomAnalysisResults',
 data :  "portfolioCategory="+ $('#portfolioCategory').val() 
 +"&subPortfolioCategory="+ $('#subPortfolioCategory').val()
 + "&subportfolio=" + $('#subportfolio').val(),
 async : false
 }).responseText;
 var ob_Grid = jQuery('#OBGrid')[0];
 var ob_GridJsonContents = eval('(' + ob_gridContents + ')');
 $('#ob_Grid').trigger("reloadGrid"); 
 ob_Grid.addJSONData(ob_GridJsonContents);
 ob_Grid = null;
 ob_GridJsonContents = null;
}