Im building my first web application and im confused about whether or not to use an iframe or panels to hold the main content of my page. It has a stagnant menu on top that should never change. Im also using update panels throughout each main content page, which don't seem to work predictively in iframes.

So should i put everything on one page? my only worry is that it would get pretty sloppy during design, and i might take too long to load...