Preloader help

Preloader screen (Frame 1):
Ok I got the first frame that says

if (_framesloaded>=_totalframes) {
} else {

Webpage screens (Frame 2):

var screen = 0;

I seen it work great once but after I reset all my Explorer settings I needed to Download the entire SWF before I even seen the Preloader screen. How can I make it play the preloader screen while the rest of the swf is being downloaded?

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