[Tickets #5973] Tabswitching (Javascript) broken with Seamonkey

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Ticket URL: http://bugs.horde.org/ticket/?id=5973
-----------------------------------------------------------------------
 Ticket             | 5973
 Created By         | hordelist at quantentunnel.de
 Summary            | Tabswitching (Javascript) broken with Seamonkey
 Queue              | Horde Base
 Version            | HEAD
 Type               | Bug
 State              | Unconfirmed
 Priority           | 3. High
 Owners             | 
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hordelist at quantentunnel.de (2007-12-07 02:21) wrote:

Using Mozilla/5.0 (Windows; U; Windows NT 5.1; de-AT; rv:1.8.1.9)
Gecko/20071030 SeaMonkey/1.1.6 with Horde Nightly from 06.12.2007.
I can't switch the configuration tabs for the different aps in the
administration section. You should be able to reproduce this also with
Firefox (not tested) or any other Gecko based browser.

The Javascript Error console states:

Error: null has no properties
Sourcefile:
http://server.intern.notar-reinartz.de/horde-cvs/js/form_sections.js
Line: 31

which is         

document.getElementById('_tab_' + openSectionId).className = null;

in function Horde_Form_Sections

Working with IE 7.0