side columns help on Atahualpa 2.21

Hi all, I run a small band/comedy website (www.cleavagedownunder.com) and use the Atahualpa 2.21 theme. I have main part and two side columns. I have played with it a little but am a bit of a spastic when it comes to full knowledge of codes and the like. However the left and right columns when used ONLY in Internet Explorer seems to have the content drop to the bottom of the screen (reads from the bottom up) but the main (middle) content reads normally! Does not occur in Firefox or Safari, so am a bit perplexed as to how to fix this! Yes I know before all the purists get into me about how Firefox is better, Yes that is my preferred system, but most people at work and novices who come to the site use IE.
Any suggestions?
Cheers
Captain From CDU
(P.S. as I am not an expert, I have not upgraded to the V3 yet, as I am too scared that I may lose all my settings! I cant even remember how to fix the 1/2 picture header photo!)