most of them you can copy the URL and then paste it into the little box (up there on the top of the message box, with the mountains and the sun on it ....between the world and the quote box.)
when playing a game, I go to ask.com or google.com, click on images and then enter what I am looking for in the search box. once I find a pic I like I click on it twice, highlight the url, copy come back here, click on the middle box and paste the url.
some myspace graphics you can paste right into the message box here and dont even need to use the box above.
hope this helps..........