if (document.images) 
{
	img1on = new Image();      
	img1on.src = "images/navigation/01_on.gif";
	img2on = new Image();
	img2on.src = "images/navigation/02_on.gif";
	img3on = new Image();
	img3on.src = "images/navigation/03_on.gif";
	img4on = new Image();
	img4on.src = "images/navigation/04_on.gif";
	img5on = new Image();
	img5on.src = "images/navigation/05_on.gif";
	img6on = new Image();
	img6on.src = "images/navigation/06_on.gif";

	img1off = new Image();
	img1off.src = "images/navigation/01_off.gif";
	img2off = new Image();
	img2off.src = "images/navigation/02_off.gif";
	img3off = new Image();
	img3off.src = "images/navigation/03_off.gif";
	img4off = new Image();
	img4off.src = "images/navigation/04_off.gif";
	img5off = new Image();
	img5off.src = "images/navigation/05_off.gif";
	img6off = new Image();
	img6off.src = "images/navigation/06_off.gif";
}

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

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