I'm not sure where this question is appropriate, hopefully someone here can help.
I'm putting together a site, located at
The left menu is currently in an IFRAME, and works in a method that clicking one of the main links reloads the page, checks the querystring, and displays the appropriate sub-links. Clicking another main menu item (or the same one again) collapses the current menu and opens another. My question is is there any way I can do this without having to reload the page? The first version reloaded the entire site, with the new menu open - I managed to contain it in an IFRAME and now only the left side reloads, but if there is any way, I'd still like to remove that slight sequence where it flashes white when the page reloads.
I'd like for the page to remain constant, but have the menu's change when needed. Is there anyway to accomplish this without using image pre-loads? (There are too many images to pre-load). I'd like to accomplish something like can be seen at www.cabair.com
Any help would be appreciated.