<script type="text/javascript">
    var center=new Ext.TabPanel({
        style:"padding:0 5px 0 5px",
        region:"center",
        activeItem:0,
        enableTabScroll:true,
        layoutOnTabChange:true,
        autoScroll:true,
        items:[{
            xtype:"panel",
            id:"index",
            iconCls:"homemanage",
            title:"测试",
            html:"<iframe src='http://www.geg.cn'scrolling='yes' frameborder=0 width=100% height=100%></iframe>"
        }]
    });

    Ext.onReady(function(){
        var vp=new Ext.Viewport({
            layout:"border",
            items:[center]
        });
    })

    </script>

------解决方案--------------------
一个简单的弹出新窗口框，附带url

<script>
//弹出窗口方法function
function showadd(){

var buttons=[{text:"确定",tooltip:'确认添加',id:"subok",handler:function(){top.Its.getWinFrame().upload();}},{text:"取消",tooltip:'取消添加',handler:function() {top.Its.CloseWin();}}] ;

top.Its.OpenWin({
url:'连接路径',
width:700,
height:500,
title:'预定',
scrolling:'no',
srcObj:window,
autorefresh:false,
buttons:buttons
});  
}

Ext.onReady(function(){
new Ext.Panel({
layout:'column',
region:'north',
height:60,
columnWidth:1,
frame:true,  
title:Its.titleInfoArr(['会议室管理','预定清单']),
items:[{
 xtype:'button',
 text:'上一周',
 listeners:{
   'click':function (){
	  showadd();
	  }
  }
  }]
}
</script>