When you say "gap" are you meaning that you want the "link bar" to be closer (almost touching) the gold frame of the top "title"? If this is what you mean, then ...
Since your images look like this ...
Title image:

Link bar image:

You will have to crop them (especially the bottom area of the "title" image) more closely to the gold frame, if you want to reduce the spacing between them.
If that's not what you mean then, I don't see any other gap when viewing your page in IE7, FF 2.0.0.1, Opera 9.01 or Netscape 8.1.
If you are seeing like a white gap or something (like the two images are not butting together) then I don't see that

, thus what browser and OS are you using?