css code to show random pictures

[glassjoe]

I have the RedTyger mod set up and its working, I am placing ads down the right side of my forum
My forum is www.runnersrule.com
my goal is to get it to look like www.teamspeed.com or www.l4p.com
Im torn on the size of my header, its huge, but so are those other sites headers and they seem to do pretty well, i know other factors are involved.

anyway, im pulling my hair out with trying to do something pretty basic.

when i have 10-15 ads, i a column, down the right side of my site, is there some code i can use to get them to appear randomly so the same ads arent always on the top??
they are just simiple jpg with links,
any help would be greatly appreciated.

thank you.