screen capure scroll

trying to capture a screenshot of a web page but need to scroll to capture the entire page. Ksnapshot doesn’t seem to have this feature.
Anybody know of a screencapture utility with this feature?

I know firefox has a ‘screengrab’ utility available thats capable of capturing an entire web page:

Screengrab! » Screengrab! (0.96)

that does the trick - thanks
Also realised - print to pdf achieves my goal as well.