function select_user_list(classid)
{   	
	new Ajax.Request('file.php?file=user_list.php&classid='+classid, {
	method: 'get',
	onCreate : function() 
					{ 
						pageScroll();
						Effect.DropOut('content'); 
						lockMenu();
					},
	onSuccess : function(transport) 
					{ 
						setTimeout(function () { document.getElementById('content').innerHTML = transport.responseText ;}, 1000);
					},		
	onComplete : function() 
					{ 
						setTimeout(function () { Effect.Appear('content');}, 1200);
					}
	});
}