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a strange problem in the tab setContentHref method

in the example of the tabbar-- Loading in iframes - On demand

http://www.dhtmlx.com/docs/products/dhtmlxTabbar/samples/loading_creating_tabs_content/tab_iframes2.html?un=1239211912000#

when first click the "Change first tab href " or the second tab is activate,it work correctly,but when the fisrt tab is activate,and now click the "Change first tab href " ,it go to a blank.html

http://www.dhtmlx.com/docs/products/dhtmlxTabbar/codebase/imgs/blank.html

but for why??

another problem:it gives me the error info as following

line:103
this._content[...] is null or not an object

the code as following:

<tr>
<td>
<div id="a_tabbar" style="width:100%;height:910; overflow:hidden;"/>
</td>
</tr>

tabbar=new dhtmlXTabBar("a_tabbar","bottom");
tabbar.setImagePath("../../codebase/imgs/");
tabbar.loadXML("test.xml?e=" + new Date().getTime());
tabbar.enableAutoReSize(true);
tabbar.setContentHref("b2","http://www.google.com");


the test.xml file:

<?xml version="1.0"?>
<tabbar hrefmode="iframes-on-demand">
<row>
<tab id="b1" width='150px'>a-1-1</tab>
<tab id="b2" width='150px' selected="1" href="www.ebay.com">a-1-2</tab>
<tab id="b3" width='150px'>a-1-3</tab>
</row>
</tabbar>