Load data in tabbar through iframes

Source
<link rel="STYLESHEET" type="text/css" href="../../codebase/dhtmlxtabbar.css">
<script  src="../../codebase/dhtmlxcommon.js"></script>
<script  src="../../codebase/dhtmlxtabbar.js"></script>
<script src="../../codebase/dhtmlxcontainer.js" type="text/javascript"></script>
 
 
<div id="a_tabbar" style="width:900px; height:490px;"></div>
<script>tabbar = new dhtmlXTabBar("a_tabbar", "top");
tabbar.setHrefMode("iframes-on-demand");
tabbar.setSkin('dhx_skyblue');
tabbar.setImagePath("../../codebase/imgs/");
tabbar.enableForceHiding(1);
tabbar.addTab("a1", "Docs", "100px");
tabbar.addTab("a2", "Samples", "100px");
 
tabbar.setContentHref("a1", "../common/test_page_1.html");
tabbar.setContentHref("a2", "../common/test_page_2.html");
tabbar.setTabActive("a1");</script>