loca1on = new Image();
	loca1on.src = "../graphics/namerica_on.gif"
	loca1off = new Image();
	loca1off.src = "../graphics/namerica_off.gif"
	loca2on = new Image();
	loca2on.src = "../graphics/europe_on.gif"
	loca2off = new Image();
	loca2off.src = "../graphics/europe_off.gif"
	
	function over_on(imgName){
		imgOn = eval(imgName + "on.src");
		document [imgName].src = imgOn;
		}
		
	function over_off(imgName){
		imgOff = eval(imgName + "off.src");
		document [imgName].src = imgOff;
		}