Question about using windows through boot camp

I have a macbook and taken into account that I also need windows for work I have installed win xp sp2 through boot camp. Does anybody know how can I take a screenshot (normaly achieved using the print screen button on a normal windows keyboard) with the built-in apple keyboard?
Thanks in advance.

Try this instead.

Apparently the above link for "Screenshot Utility" is shareware. I wish they'd disclose that on their site.

I found this other util Screenhunter with free version; tried it and I like it:
http://www.wisdom-soft.com/products/screenhunter.htm