if (document.images) {
	current_a = new Image(57,20); current_a.src = "/exhibits/images/1exnav_a.gif";
	current_b = new Image(57,20); current_b.src = "/exhibits/images/1exnav_b.gif";
	up_a = new Image(70,20); up_a.src = "/exhibits/images/2exnav_a.gif";
	up_b = new Image(70,20); up_b.src = "/exhibits/images/2exnav_b.gif";
	pre_a = new Image(55,20); pre_a.src = "/exhibits/images/3exnav_a.gif";
	pre_b = new Image(55,20); pre_b.src = "/exhibits/images/3exnav_b.gif";
}

function action(imgName, theImg) 

{
	if (document.images) {
	document[imgName].src = theImg;
	}
}


function inaction(imgName, theImg) 

{
	if (document.images) {
	document[imgName].src = theImg;
	}
}