.qa-nav-main {clear:both; background:#fff url(nav-main-bg.png) repeat-x left top;} how do I make width 100%?

Question

adding width:100%; did't work

Answer 1

Giving an example URL would make things a lot easier!

But I think you need to increase the width of the parent element, qa-body-wrapper (it's set to 980px on this page). You will probably also need to change some sub elements like qa-main.