Hello everyone, i am as new to flash as i am to this forum

I am trying to make a flash website, my problem is that the intro should be aroud 700X400px and the content part 700X600. Is there any way to change the document size on the run or should i make two different swf files?

If i need to make two files, is it possible to preload the website file from the intro file?

Any help will be greatly appreciated