This has probably been asked a hundred times, but I can't find the answer.

I'm working on a drag and drop site. All browsers work fine except Firefox. I think the problem lies within "ondragstart". When I move images, Firefox tries to copy the image at first (giving the ghost of the image).

When I release my mouse, it will then grab hold of the image and allow me to move it. It appears ondragstart works for other browsers; not allowing the image to try to copy, but just move the image itself.

Is there a Firefox equivalent to ondragstart that will cancel the copying of the image and just move it?