<div style="margin-bottom:10px">
 <a href="#" class="easyui-linkbutton" onclick="addTab('google','http://www.google.com')">google</a>
 <a href="#" class="easyui-linkbutton" onclick="addTab('jquery','http://jquery.com/')">jquery</a>
 <a href="#" class="easyui-linkbutton" onclick="addTab('easyui','http://jeasyui.com/')">easyui</a>
 </div>
 <div id="tt" class="easyui-tabs" style="width:400px;height:250px;">
 <div title="Home">
 </div>
 </div>

 function addTab(title, url){
 if ($('#tt').tabs('exists', title)){
  $('#tt').tabs('select', title);
 } else {
  var content = '<iframe scrolling="auto" frameborder="0" src="'+url+'" style="width:100%;height:100%;"></iframe>';
  $('#tt').tabs('add',{
  title:title,
  content:content,
  closable:true
  });
 }
 }