Hey lady,
I placed the css code I use in the group Boomer Central. I try to put as many help topics in there as I can. Drop by there and you can see the code I use and all you have to do is put the place where you have your background picture and it will do fine. As Liz says, if you use a mypace code sometimes you have do play with the design my profile boxes to make it all work right.
If you need any help just let me know and I will be happy to help ya.