Help a Fellow Blogger?

I need help with this blog! I need to add a second sidebar on the right (as you can see, I've already spaced it out) but I need help with the HTML code. I've managed to add a second sidebar, but then my main content drops to the bottom below the longest sidebar. Suggestions anyone? Thanks in advance, and if you help me and are not already on my blogroll, you will definitely be added as well as given credit at the top of the new sidebar :-)