Cant find css bug, please help


I am having issues with the css for a website, I have a header company banner image on this site which looks fine on the home page but for the rest of the site it drops to become flush with the main content background.

I cant for the life of me figure out why it is doing this, I cant find any differences in the code between the home page and the rest of the site and its doing my head in.

Can someone please help?

Correct css layout on home page
Adelaide Accountants - Adelaide Registered Tax Agents - Susan Nash & Associates - Australia

incorrect css layout (not just for this page but for all others as well)
Tax Returns - Adelaide Accountants - Susan Nash & Associates

Because you add left and right borders to the tabs on the other pages, it widens your nav bar, and makes the contact us tab drop to the next line. You could try adding new padding to the #navtab styles to fix that:

#navtab a {
    background-color: #F5F5F5;
    border-color: #F5F5F5 #999999 #999999;
    border-style: solid;
    border-width: 3px 1px 1px;
    color: #333333;
    font-weight: bold;
    [COLOR="Red"]padding: 0 12px 3px;[/COLOR]