Put {IMG} before the address, and {/IMG} after the address, with no spaces, and with [ and ] instead of { and }. For example:
{IMG}
http://homepage.mac.com/pkrwud/.Pict...isc./nhra.jpeg{/IMG}
(except the { & } should be [ & ] )
The result should be a picture of John Force I took at the WinterNationals a couple years ago:
Take care,
-Chris