Try this:

(<)img src="http://users.surfanytime.co.uk/disguise/janoog1.jpg"
width="640" height="480">

Just delete the '(' and the ')' at the start, so let the '<' at his place, further dont touch anything and put it in your sig/message.

You can change the link of the picture, just rewrite the old link. You know: http//... etc.