Go to the edit feature in your post it's in the line straight to the right of your name and it looks like a little tablet with a pencil on it, click that. Then just click at the bottom and hit the backspace button on your keyboard till it's all erased, then you can start over.
Hope that helps?
You should try photobucket, image shack had a virus on their site not too long ago and it infected all the picture links. JFYI wanted you to know.