okay, here we go:

it's not a high end solution but it will work.

User-Icon upload:

For helping others to remember your face, you may now upload an user-icon which will be shown right next to your postings.

for doing so you need to

• have a picture
• resize it to exactly 40px by 40px
• save it in .gif format
• using your exact username (case-sensitive!)
• upload it by clicking here
  you don't need to enter an image name in the form if it doesn't contain any voids
  otherwise use your username (without '.gif')