Kate - here are the pics I did your avatar from - they are sized and some came to me sized a bit small - These are 2 you don't need to fix - they're good for posting now - you can save them to your computer from here
here is a resizer program that may help
http://bluefive.pair.com/free95.htm
Scroll to PixResizer……Download the program..it’s really small and very easy to install – Depending on the size of your image you just have to click ONE SIZE (USUALLY 50%) or 460 Pixels and it resizes it for you...