/** ϵͳ����
 * @author LM
 */
Ext.onReady(function(){
	var viewport=new Ext.Viewport({
		id:'viewport',
		layout:'border',
		frame:true,
		items:[
		       {region:'north',height:pageheight*0.1,html:'<iframe width=100% FrameBorder=0 MARGINWIDTH=0 MARGINHEIGHT=0 src="top.html"></iframe>'},
                tabs]
	});
});