Is better to edit the logo because in css it would allow you to move it to left, right and or center to get it where you want you would have to add like 4 more css properties.
Let me know which way your going to do it, I can help you with css.
posting your forum URL helps in providing better suggestions ...
Mr.tnr - Sure, I'll do it in CSS if you can write it for me, I'm no good with CSS
ranjani, my forum URL :
http://erazed-forum.com
you have login / register information bar for the guests - moving the logo to the top disturbs the info bar view ...
in global.css file
find .logo { } AND change it to .logo {margin-top:2px; text-align:center;}
find .fixed_wb { AND change it to .fixed_wb {margin-top:128px;