The only way to do this is to possibly optimize the flash items so that they load faster. As for the 'blinking' each time a page is loaded, this is caused because the flash player, (required for flash content, menus or not) must initialise the items before it can display them.
The only real solution is to ask yourself if your really require the menus to be in flash and not html/css based.
If I install html/css/java menus in the same AP div would I get the same problem?
By the way, I've just tested my page http://www.graemephotographer.com/testtwo/commissions.html (menus taken out)
in Firefox on windows and nothing appears. The browser is not loading my main porfolio swf.
Sorry to be a pain, any ideas as to why this is happening?
Much appreciated, Damien