White line just above header-in FireFox not in Explorer

[longest_name_ever]

I'm using Zen Cart 1.3.8a
It was installed as 1.3.8a (not upgraded)
I did install security_patch_v138_20090619
and I also installed the drop down menu "css_horizontal_drop_down_menu_1-5"
found here...
http://www.zen-cart.com/index.php?ma...roducts_id=479

Now when I load the site in FireFox, and Google Chrome there is a weird white line just above the Header...However in Explorer it looks just fine.

here is a link to the site...
http://www.kimscalendars.com/store/

Any Ideas?
Thanks in advance.

[longest_name_ever]

I figured it out...Thanks!

[MortiferousGr]

I would be extremely happy if you could share with me the solution.

Thanks in advance!

[MortiferousGr]

i figured out a solution, that worked for me.

Add to
#logowrapper

margin-top: -1em;

Problem solved!