Controlling what loads first - HTML or Flash

This is probably a dumb question and I think a Javascript thing but here goes.

I have a logo (swf) on my site that is 178K and hence loads after the rest of the HTML page.

Want I need to achieve is to load the swf movie and as soon as it starts to play, load the html page content.

I am assuming I need to start looking into javascript window.onload but wondered if there is any other ways of doing this using Flash.