Css help cant get sidemenu to work

http://www.websiteninjas.com/H080J03/Blog.html
thats the web page i am working on

look at the site in IE, that is the look im going for, Firefox on the other hand doesn’t like the site. im trying to follow this guide for a side menu. all I need is for the div content to have a background. if I take out what the guide tells me, i don’t even see my content background, unless i manually set the height of the div. so basically i want height 100% to work.

I hope I made sense

btw click on the H080J03 link in the upper right hand corner, to see the sites real design, and tell me what you think of it.

never mind i fixed it useing the tut i had link to, turns out i wasn’t clearing some of the div’s