Getting background to strech to end of content in firefox

[spykadesign]

I've set up a two colum layout with footer and header in css. The two colums are contained in the div with a background image which spans both colums. In IE it works fine however in firefox the container div wont contain the two colums it ends above them (I know this because it has a border) So im not sure whats wrong, any ideas?

btw the XHTML and CSS have both passed validation.

[spykadesign]

Not to worry i fixed it - added <div style="clear:both"></div> under both the colums.