Snow animation in Flash 8

If anyone can help me I would be very thankful. I found a way to create snow animation using flash 8 from the Kirupa site, but now I need to figure out how to get to the next step. The animation I am doing is supposed to have an image appear (ok) and for snow to start falling over the image (ok) that snow is supposed to gradually increase in numbers and in size until the screen is completely white (this is where I am having a problem). Can anyone help me figure out how to make this happen? Please keep in mind that I am not very familiar with action scripting, but any help you can give me would be appreciated!