Onmousedown Pocketpc 2003

I wrote a script that uses onmousedown and onmouseup in javascript that
works great in ie and firefox on windows2000. It looks as if the
pocketpc 2003 ie browser dosn't support onmousedown or onmouseup and
only such as onclick.

I need to be able to submit a form when the mouse is held down on a
button and submit a different form when the mouse is lifted up from the
button. could anyone tell me of anything I could substitute onmousedown
and onmouseup with, i know onclick could substitute for on mouse up but
i'd prefer not to but i still need somthing for on mouse down.