CSS problem & PHP error

Hey all..

So normally I would spend some time figuring this out on my own, but I’m super-frustrated at the moment and am hoping another set of eyes will help.

CSS issue: This is why I hate using other people’s code (themes) and trying to edit it to do what I want. Looking at it, it makes me wonder what the hell they were thinking?

Anyways, this the page:

https://digisitedesigns.com/bills_auto/

The problem is the menu. It looks ok in firefox, but in IE the text is at the top, along with the dividers.

Here is the pertinent CSS info(I think that’s where the problem is):

#menu {height:52px;width:798px;float:left;background:url('images/menubg.gif') repeat-x;border-bottom:1px solid #FFFFFF;overflow:hidden;}
ul.menu{height:52px;line-height:52px;float:left;list-style:none;margin:0;padding:0;}
ul.menu li{float:left;list-style-type:none;margin:0;padding-left:25px;padding-right:25px;border-left:1px solid #546A7E;border-right:1px solid #121C2A;}
ul.menu li a {font:14px Tahoma;color:#FFFFFF;text-transform:uppercase;}
ul.menu li a:hover {text-decoration:underline;}
ul.menu li a:visited {font:14px Tahoma;color:#FFFFFF;text-transform:uppercase;}
ul.menu li a:visited:hover {text-decoration:underline;}

And also, whenever I try changing something in the ‘theme editor’ in wordpress, I hit ‘update’ and get this error:

Warning: Cannot modify header information – headers already sent by (output started at /home/wakeclan/public_html/digisitedesigns.com/bills_auto/wp-content/themes/valid-blue-01/functions.php:8) in /home/wakeclan/public_html/digisitedesigns.com/bills_auto/wp-admin/theme-editor.php on line 75

This is another one:

Warning: Cannot modify header information – headers already sent by (output started at /home/wakeclan/public_html/digisitedesigns.com/bills_auto/wp-content/themes/valid-blue-01/functions.php:8) in /home/wakeclan/public_html/digisitedesigns.com/bills_auto/wp-includes/pluggable.php on line 868

Any help at all is appreciated…before I pull my hair out.