z-index arranges element priority in css
http://www.w3schools.com/cssref/pr_pos_z-index.asp
img {
position: absolute;
left: 0px;
top: 0px;
z-index: -1;
}
I built my own CSS over time, but really you just steal stuff to get started. Its not really stealing, its like stealing plans to make a door frame a certain height and width.
yay internet.
also i like nodefire navigation, it makes javascript and css backup nav.
its legit but not free.
i may be able to look at your stuff tomorrow.