Lately, I have been making my menus using lists and get everything to where it is working properly. Then I click on a link in the menu and go to a new page and the background image menu moves up ever so slightly so that the background image it is not covering the menu bar completely like it was before. I have no idea why it's doing this? Why it would be right in one instance and then after clicking on a link it changes. Can anyone help me?
You can sort of see what I am talking about at...

Does it have anything to do with changing the page from html to php?

Thanks for any help