Ext.onReady(function() 
{
	var taskmyad = {
		run: function()
			{
				var msg = Ext.get('myad');
				msg.load({url:'impression.php', params:'site=myad', text:'loading...'});
				msg.show();
			},
		interval:90000
		}
	Ext.TaskMgr.start(taskmyad);

});