You can attach an image (photo) to your message which will create a thumbnail image. Folks click on the thumbnail and voila- it is enlarged. To do this, click on the "Go Advanced" button next to the "Post Quick Reply" button - they are both under the messaging box. Then click on the little paper clip. You'll figure out the rest.
The other option is to use Photobucket or the like. You'll figure that out too. I'm a little hung over to walk you through it. Good luck.
In the meantime (for your entertainment)... here's a video of Justin Bieber puking on stage:
[ame=http://www.youtube.com/watch?v=KY3tLA544r4]Justin Bieber throws up on stage in Arizona - YouTube[/ame]