If you have this problem, you may have just upgraded to IE10.
The solution is easy, you need to switch on compatibility mode in IE 10. At this point, I will direct you to Cory Peters who will show you how to do this (its easy)
This issue is likely to crop up more as SharePoint 2007 persists and browsers progress..
F12 Internet Explorer Developer Tools for Troubleshooting CSS Issues
A quick tip I picked up from a Microsoft SharePoint tutorial – on CSS and SharePoint was that in IE9 – the F12 function key brings up a set of useful developer tools. This will be very helpful to me in troubleshooting a new page layout for a client – which behaves itself in all browsers except Internet Explorer.
IE10 Compatibility Checker
While I am sorting out IE9 issues – it will be handy to test for potential IE10 issues while I am about it – learn more about the IE10 Compat Inspector