Someone

<script type="text/javascript">
<!--

navRollOver = new Array()

//On
navRollOver[0] = new Image()
navRollOver[1] = new Image()
navRollOVer[2] = new Image()

//Off
navRollOver[3] = new Image()
navRollOver[4] = new Image()
navRollOver[5] = new Image()

//On Images
navRollOver[0].src = "images/1_on.png"; // the left button
navRollOver[1].src = "images/2_on.png"; // the middle button
navRollOver[2].src = "images/3_on.png"; // the right button

//Off Images
navRollOver[3].src = "images/1_off.png"; // the left button
navRollOver[4].src = "images/2_off.png"; // the middle button
navRollOver[5].src = "images/3_off.png"; // the right button


function leftButtonOn()
{
	document.PC.src = navRollOver[0].src;
	return true;
}

function leftButtonOff()
{
	document.PC.src = navRollOver[3].src;
	return true;
}

function middleButtonOn()
{
	document.PC.src = navRollOver[0].src;
	return true;
}

function middleButtonOff()
{
	document.PC.src = navRollOver[3].src;
	return true;
}

function rightButtonOn()
{
	document.PC.src = navRollOver[0].src;
	return true;
}

function rightButtonOff()
{
	document.PC.src = navRollOver[3].src;
	return true;
}
//-->
</script>