// preload images

if (document.images) 
	
	{
	var onea = new Image();
	onea.src = "images/nav_one.gif";
	var oneb = new Image();
	oneb.src = "images/nav_rollone.gif";
	
	var twoa = new Image();
	twoa.src = "images/nav_two.gif";
	var twob = new Image();
	twob.src = "images/nav_rolltwo.gif";
	
	var threea = new Image();
	threea.src = "images/nav_three.gif";
	var threeb = new Image();
	threeb.src = "images/nav_rollthree.gif";
	
	var foura = new Image();
	foura.src = "images/nav_four.gif";
	var fourb = new Image();
	fourb.src = "images/nav_rollfour.gif";
	
	var fivea = new Image();
	fivea.src = "images/nav_five.gif";
	var fiveb = new Image();
	fiveb.src = "images/nav_rollfive.gif";
	}
	
// activate images

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

// deactivate images

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