function RollOn( ImageDir, ImageName, ImageExtension )
{
	if ( document.images )
	{
		document.images[ImageName].src = ImageDir + ImageName + "2" + ImageExtension;
	} // knows about images

} // RollOn

function RollOff( ImageDir, ImageName, ImageExtension )
{
	if ( document.images )
	{
		document.images[ImageName].src = ImageDir + ImageName + "1" + ImageExtension;	
	} // knows about images

} // RollOn