On this board the image tag is different than other boards, you need to use the (image)(/image) tags here, the other mistake you are doing is posting the link to the file followed by "?t=1187934955" , this is telling the browser to use the script on photobucket's server so that the image displays only in their pages.
the image file should (usually) end in .jpg, .gif, or .png (if allowed by this board) to correctly display here.

HTH