BLOGEMERGENCY!

Did anyone notice that the very day I post and brag about the easy way I know to make pictures big on a blog, that I delete all of my code and settings and my side bar goes totally South? I have screwed this whole thing up and can't figure out how to get it back to the way it was. I even enlisted very technical savvy Mr. Hill for his wide range of Internet services and together we were unsuccessful. I know it's possible to have it all, you know...big pictures, side bar, 3 column background....but I've messed it up some how.
Can anyone help me????
Where did I go wrong and how can I fix it?