Height of the top region in IE6 and IE7

The height of the top region in IE6 and IE7 is greater than in other browsers (Opera, FF, Safari); see attachment.
I tried following changes in ie6.css:
- setting "0" padding-bottom for all divs, which are inside this region: no effect.
- setting specific height of the #top div (30px, or 20px or even less as an experiment): it helps, but only partially (the real height in IE is still greater than in other browsers, but the difference is not so big).
Please, do you have any idea, how to solve it? Thanks for any help, Eva