if (document.images) {
	homeOn = new Image();
	homeOn.src = "/images/nav/homeOn.gif";
	homeOff = new Image();
	homeOff.src = "/images/nav/homeOff.gif";
	exhibitionsOn = new Image();
	exhibitionsOn.src = "/images/nav/exhibitionsOn.gif";
	exhibitionsOff = new Image();
	exhibitionsOff.src = "/images/nav/exhibitionsOff.gif";
	artistsOn = new Image();
	artistsOn.src = "/images/nav/artistsOn.gif";
	artistsOff = new Image();
	artistsOff.src = "/images/nav/artistsOff.gif";
	aboutOn = new Image();
	aboutOn.src = "/images/nav/aboutOn.gif";
	aboutOff = new Image();
	aboutOff.src = "/images/nav/aboutOff.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");
	}
}