when i add add the header using element of flash, the page are really slow to open. the performance is very bad.
it's moodle 1.5.2 don't support flash / movie?
That sounds like the Flash movie is large, or heavy on the browser itself. Nothing to do with Moodle performance... 
I would really strongly recommend NOT embedding a Flash object on every single page! Your users will not be grateful for the decreased loading speed (which is because of initialising the Flash software/applet, not because of Moodle).