how can I reduce the space of the header in iWeb?

Hi,
I created a website using iWeb and when I posted photos, the horizontal pictures (landscape oriented) have too much space at the top between the header I created and the top of the picture. It causes the viewer to have to scroll down to view the picture. Can anyone tell me how to reduce this space at the top?
Thanks!
Keren

Well if you are using iWeb just drag the photosif you are using HTML try putting it inside a div