flash (macromedia): try googling 'flash preloader' or 'flash progress bar', there's lots out

Hello I have been surfing the internet and different websites that use flash
for their intro, and I was wondering how they developed their initial loading
design (the part that shows the progress of your page loading in %)? I can't
find any information on how to design or even develop that part of a flash
application. Can anyone help?

There's a cool little thingy about making these at ianlabs.com, and you can
download a fully editable one. It's got all the steps outlined, and it works
really well. You can check it out here:
http://www.ianlabs.com/tuts/preloader/index.shtml