function showChat(){	
	var win = new Ext.Window({
		title: 'Chat con WebMaster',
		width: 800,
		height:650,
		maximizable:true,
		html:'<iframe frameborder="0" src="http://www.inictel-uni.edu.pe/modulos/chat/chat/chat.php" width="100%" height="100%"></iframe>'
	});
	 win.show();	
}