Images Blink When Open Site In Browser

Hey there!
I have published a simple webite. Four buttons...each triggers a diff. movie clip with an image in it when pressed.
The images are set at 0 opacity on enter frame...but when the site opens in the browser, the images flash, blink for a second ...then disappear.
My timeline is on frame one only.
It seems like the site doesnt reconnize the command of 0 alpha on frame one until it is too late.
Not sure why the blink
please help!
thanks so much

are you sure you mean onEnterFrame? that would run at your movie frame rate which would effectively check the condition many time a second. can u post an example?