Set the 'href' property for the tab panel to delay loading its content.
<div class="easyui-tabs" style="width:700px;height:250px">
<div title="About" style="padding:10px">
<p>The first tab.</p>
</div>
<div title="My Documents" style="padding:10px" href="_content1.html"></div>
<div title="Help" data-options="iconCls:'icon-help',closable:true,href:'_content2.html'" style="padding:10px"></div>
</div>