http://forums.nitroexpress.com/showflat.php?Cat=0&Number=267133&an=&page=0&vc=1

I see your later attempt worked. As a simple guide any image link needs to end with a jpg or gif for a image to display. Some photo hosting platforms still have a code which won't work though, they probably do not want images loaded on them to be "hot" coded to other sites.