Midlands Macintosh User Group

Hi, I'm looking to upgrade to Snow Leopard from Tiger 10.4.1. Does anyone know if I will have any probs with my existing programs, or will I have to upgrade those as well? Photoshop CS2 (9) Illustrator CS3 (13) Indesign CS (3) - I know it's old, but it's all I've needed til now. Many Thanks, Mel