You can click
'post new message' then 'switch to image mode' to upload your image then cancel posting the new message. Everything you've uploaded can be found by clicking 'My Images', including the embed codes for putting them in other messages.
Bit of a roundabout way of doing things, I know, but it works.
( ,
Sun 18 Jul 2010, 1:32,
archived)
Bit of a roundabout way of doing things, I know, but it works.