Use the html tag-pair on the html address of the actual image/graph you wish to post. [ img ] /img ]
It has to be a .gif .jpg .img .etc address, not one of those javascript style addresses. *such as http....image=somestring, style=blahblahblah* (wont work)

Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...