Emergency Editing Project

I would like someone to help me with my blog. I want someone who is familiar with javascript/html who can edit my blog template. I can get the banner ad to work with internet explorer;but try as I might, I can't get it to work with firefox. I need this done quickly. Also the text in the post itself will not doublespace, it seems a bit cluttered. If you are not able to do it, please don't bother. I will be providing you with private information, so you MUST have good feedback and a long history on this site. This is not a major undertaking. I will pay you $15 if you can show me what you did and how you did it if you are the one with the winning bid. This a bit of an emergency as I want to start really promoting it hard; but can't because the banner won't work in firefox.