if(document.images)
{
  buttonOn = new Image(); buttonOn = "../images/but1on.jpg";
  buttonOff = new Image(); buttonOff = "../images/but1of.jpg";
}

function press(imgName)
{
   rollover('activeButton', buttonOff);
   rollover(imgName, buttonOn);
}

function release(imgName)
{
   rollover(imgName, buttonOff);
   rollover('activeButton', buttonOn);
}


function rollover(imgName, newImage)
{
	if(document.images)
	{
	   document.images[imgName].src = newImage;
	}
}