If you need a (very) good freeware screen capture utility, including the ability to ‘grab the whole document top-to-bottom’, I can highly recommend FastStone Capture. A cosy 1.2MB download, with all the functions and outputs you’ll be wanting (and more), and there’s even a ‘portable’ version of it. Which is handy if – let’s say – you’re using a PC on a corporate network, and the IT division has blocked installation of new software.