<div id="a_tabbar" style="width:400;height:100"></div>
<script>
 
            tabbar=new dhtmlXTabBar("a_tabbar","bottom");
            tabbar.setImagePath("imgs/");
 
            tabbar.loadXML("tabs3a.xml");
            ...
            tabbar2.disableTab('b3',true)
            tabbar2.enableTab('b3')
            tabbar2.hideTab('b2',true)
            tabbar2.showTab('b2')</script>