1) right click on the image/emote that you want to post
2) choose "copy image location" (in FireFox) or in IE goto properties and copy the Address for the image
3) open new post
4) paste the link into the text dialog box. Make sure that the link ends with some form of image extension (.img, .gif, .jpg, etc...), if there is no extension or it is some other thing (.asp, .php, .htm, .html, etc...) then you'll need to copy and paste again making sure to get the image location.
5) surround the link with
It should look like this when done:
I guarantee this will work for all web browsers, and all bulletin boards (assuming they have enabled using BBcode, if not there are other ways of doing it using html code, but that's a bigger pane)
