Hi I have a really complicate question regarding the conflict of drop down menu embeded in AppleZen and JGallery.

I installed Jgallery first and found out when I go to Gallery page, there will be some error notice in drop down menu, which is like: Notice: Undefined offset: 2 in /mnt/w0911/d02/s16/b0316c3a/www/clipontogo.com/includes/classes/categories_ul_generator.php on line 63

Notice: Undefined offset: 2 in /mnt/w0911/d02/s16/b0316c3a/www/clipontogo.com/includes/classes/categories_ul_generator.php on line 72
you can see it live here: http://clipontogo.com//index.php?main_page=gallery
the menu in the bottom of the page belongs to tpl_main_page.php

After million times of trying I found if I move the drop down menu section from tpl_main_page.php to tpl_header.php, the problem will be automaticly solved, but only in FIREFOX! When I browse it in IE7, the drop down menu will not have level2,3...anymore...
You can see it live in the same address: http://clipontogo.com//index.php?main_page=gallery
the menu below the branding is belong to tpl_header.php

So my question is:
1, Is there anyway to use Jgallery normally in AppleZen without messing up the drop down menu?
2, If move the drop menu section from tpl_main_page.php to tpl_header.php is a correct method, why it's not showing normal in IE7? Any way to fix it?

Thanks a lot!!!!!!
Vanessa