Banner images on the right column

Hi
Id like my image banners to fit the entire space of the right column (as it happens when placed in the left column). However at the moment it places a margin in every side of the banner.
How can I achieve that?

If you go to http://www.vispro.co/usa (user and pass: "vispro") you will what I mean:

The blue banner image over PDL NEWS on the left column fits the entire spacem with no margins. However the image on the right column has margins all around.

Thank you in advance

Ive found out that adding " clear" in the Module Class Suffix of the Advanced options of the banner module does the trick... is that the right way to do it?