enter_upImage = new Image();
enter_upImage.src = "images/enter_hover.png";
enter_downImage = new Image();
enter_downImage.src = "images/enter_click.png"
enter_normalImage = new Image();
enter_normalImage.src = "images/enter_trans.png";

function enter_changeImage()
{
  document.images["enter"].src= enter_upImage.src;
  return true;
}
function enter_changeImageBack() 
{
   document.images["enter"].src = enter_normalImage.src;
   return true;
}
function enter_handleMDown()
{
	document.images["enter"].src = enter_downImage.src;
	return true;
}
function enter_handleMUp()
{
	changeImage();
	return true;
}