I use photobucket
so I can't comment on ImageShack specifics, but I imagine they are similar. When logged onto PB, there is a symbol on each of the pictures. Clicking on that brings up a little sub-menu, one of the options on the sub-menu is "get links". I click on that, and 3 or 4 types of links are shown (insert into email, insert into web, etc.). I choose the "insert into web page" option. Clicking on the links copies them to the clipboard, and then all I have to do is paste them in my xweb post. They don't actually show right away, it just looks like a bunch of HTML code. But when I post the thread to xweb, they show up.
Pete