First you need to get it up on the Internet somewhere.  Try flickr.com if you have no other option available to you.  Then with the "Comment formatting" option set to "HTML Formatted", you insert text into your comment that looks something like:

Some text commentary here.<p>

<img src="http://my.picture_location.com/my_picture_url.gif" width="90%"><p>

Some more text commentary here.

OK thanks Stuart - from the Ciferno paper, lets try this: http://www.flickr.com/photos/16092113@N00/86990826/ click on the "ALL SIZES" button in upper left
perhaps this will work. sorry for graphics learning curve.
Actually, in the above (successfully..;)linked graph, the combustion component of various fossil fuels vs liquids from coal are all about identical (makes sense). Its just that the refining component for CTL creates much larger GHG (the purple area). As a component of total GHG emissions, CTL looks to be 6 times the amount of marginal GHG than natural gas or crude oil, even though the choice to use fossil fuel liquids itself is much of the GHG equation.

sasquatch's image -click to see bigger version
ok heres my first shot at html image linking: