Strange gaps in Firefox

Hello,

I am just working on one of my first css design, and I one problem appear.
I don't know how to avoid strange gap that appears above and below light green area at following URL: http://www.shimoda.hr/novy/web-dizajn.htm

This gaps appears in Firefox, while in IE is ok.

Please, look at the attachment and see what I mean.

I believe the solution is pretty simple... but I spent hours and hours till now, and don't know how to fix it.

Thank you very much.

The bottom one is coming from the bottom margin you have on your paragraphs. The top one is coming from the top margins you have on your left and right columns.

Thanks Aerospace.
I know that ;)

But... meanwhile I found the solution.

Thanks anyway.