Header image and faux columns

I’ve made much progress since starting and have learned a lot. I just have a few more problems with my layout and I’ll be completely happy!

I’ve used faux columns on my layout and they look great. I put the faux column image in place of my header image, so now I don’t have a header image. I’ve been trying many different codes such as
#header {
background: url(“/header.jpg”)
no-repeat top left; }
#headerimg {
height: 588px;
width: 800px; }
and it’s not quite working. Are there any other codes to fix this?

One more thing: how can I get my footer to stay at the bottom on the page?

Thank you!