Flash website

hi, I am trying to create a flash website on flash 8 for a personal reason. like this site www.hybridworks.jp i want a new gif to appear when a new selection is made from the menu and how to make the preloader load along with the actual contents loading progress. hope i am clear. Can you not please just give me a brief explanation because i am quite new to flash and won’t now how to do some things.

Please reply as soon as possible.
Thank You