function hideHiddenElements(){				
	$.each($('input:[type="hidden"]'), function() {   					
		//convert the element to a jquery object (so we can manipulate it)
		var hiddenElement = $(this);
		hiddenElement.addClass('hidden');		
	});		
}

$(document).ready(function(){		
	//will get called by xajax to hide dynamically added hidden fields
	hideHiddenElements();	
});