if (document.images) 
{
	var btn01 = new Image();
	btn01.src = "images/btn01.gif";
	var btn01_roll = new Image();
	btn01_roll.src = "images/btn01_roll.gif";
	var btn02 = new Image();
	btn02.src = "images/btn02.gif";
	var btn02_roll = new Image();
	btn02_roll.src = "images/btn02_roll.gif";
	var btn03 = new Image();
	btn03.src = "images/btn03.gif";
	var btn03_roll = new Image();
	btn03_roll.src = "images/btn03_roll.gif";
	var btn04 = new Image();
	btn04.src = "images/btn04.gif";
	var btn04_roll = new Image();
	btn04_roll.src = "images/btn04_roll.gif";
	var btn05 = new Image();
	btn05.src = "images/btn05.gif";
	var btn05_roll = new Image();
	btn05_roll.src = "images/btn05_roll.gif";
	var btn05a = new Image();
	btn05a.src = "images/btn05a.gif";
	var btn05a_roll = new Image();
	btn05a_roll.src = "images/btn05a_roll.gif";
	var btn06 = new Image();
	btn06.src = "images/btn06.gif";
	var btn06_roll = new Image();
	btn06_roll.src = "images/btn06_roll.gif";
}

function act(imgName) 
{
  if (document.images) 
    document.images[imgName].src = eval(imgName + "_roll.src");
}

function inact(imgName) 
{
  if (document.images)
    document.images[imgName].src = eval(imgName + ".src");
}