Help with tweens between page links :(

Hi all,
This is my very first attempt to build a site in flash cs3 or infact any flash program.

The site and pages are basic and work ok on the laptop i have designed it on

But when i tested it on other laptops and pcs the motion tweens between each page, when i click on a link dont work smooth i.e fade out, then the next page fading in

Half way through the tween to the next frame the same page flickers into view

Please could anyone point me in the correct direction to where i might be going wrong?

Would it be any help i post the pages on here so anyone can have a look at it?

best regards