How do I get rid of the gap?

Currently when anyone links from one of my HTML/Flash pages to another the screen goes blank (to the background colour) for a few seconds before the next page comes up. Is there anything I can do about this? I’m currently experimenting with preloaders whch seem to improve the situation but not completely solve it. Obviously I know I could avoid this if I used Load Movies and had the whole site placed one a single HTML page - but I’ve read that this limits Search Engine placing.