Revealing hidden parts of background image with mouse movement?

I have this image that I would like to use as the header logo for my website:

Now, the image in the background of the demon looking thing is much larger than that. I would like to make the logo using flash, so that if the user’s mouse is on top of the logo, it will scroll… For example, if the mouse is over the bottom of the logo, it will scroll downwards to reveal lower portions of demon image by scrolling down.

If that makes any sense… I am pretty new to flash and I have never done actionscript before so after looking at a few things this is all I could come up with:

moveInterval = setInterval(moveImage,5);

function moveImage() {
if(_root._ymouse > _root._y/2) {

} else {
    
}

}

I have the background image named bg_mover… am I onto the right track? I don’t really know what to do next here ;(

edit: looks like I accidentally posted this in the wrong subforum, should be in MX 2004.