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tabbar height not stretching out fully

Our tabbar table only goes about 2/3 the way down of the full height. The div seems to stretch perfectly to the full height (as I can write something after the div or put on a border around the div and verify this) but the tabbar table holding the info (the scrollbar as well) will not stretch all the way down. Thanks for any help.

Here is the div code:
<div id="a_tabbar" style="width:100%;height:100%;"></div>

And the tabbar code:
tabbar=new dhtmlXTabBar("a_tabbar");
tabbar.setImagePath("dhtmlxTabbar/codebase/imgs/");
tabbar.setOffset("50px");
tabbar.setMargin("50px");
tabbar.setHrefMode("ajax-html");

tabbar.addTab("a1","Activity","100px");
tabbar.addTab("a2","Contacts","100px");
tabbar.addTab("a3","Companies","100px");
tabbar.addTab("a4","Sales Opportunities","150px");

tabbar.setContentHref("a1","crm_activity.php");
tabbar.setContentHref("a2","crm_contacts.php");
tabbar.setContentHref("a3","crm_companies.php");
tabbar.setContentHref("a4","crm_salesOpps.php");
            
tabbar.setSkinColors("#FCFBFC","#F4F3EE");
tabbar.setTabActive("a3");