I dunno how to do it .....
http://www.swingingheaven.co.uk/swingers-forum/viewtopic/56781.html
Try the above link and it may also be worth reading the site rules regarding what type of photo you can use in your avatar (should not include genital shots)
Good luck
OK - I've done it now, thanks - I think I've changed the avatar too, but just in case it hasnt work - avert your eyes !!
right - here is the image
Did it work ?