Photobucket downsizing is permanent. You can size your images with your code though if it is a 3000x1000 image and you display it as 300x100, it still loads the memory of the big image
Also, your image isn't working because you didn't use the source code, but rather the webpage code.
http://s275.photobucket.com/albums/jj318/wishinfishin715/?action=view¤t=IMG_0038.jpg
is the page code.
If you go there, you see 4 options for the source code.
http://i275.photobucket.com/albums/jj318/wishinfishin715/IMG_0038.jpg
is the source code to the image
Then you can do [ IMG]http://i275.photobucket.com/albums/jj318/wishinfishin715/IMG_0038.jpg[/IMG]
or
< img src="http://i275.photobucket.com/albums/jj318/wishinfishin715/IMG_0038.jpg" width="300" height="100" alt="" />
for visual image sizing
(both without the space that I inserted before the [ or