version = parseInt(navigator.appVersion.substring(0,1));

if (version >= 3) {
		menu1on  = new Image();		menu1on.src  = "./photo/5_2.jpg";
		menu1off = new Image();		menu1off.src = "./photo/5.jpg";
		menu2on  = new Image();		menu2on.src  = "./photo/6_2.jpg";
		menu2off = new Image();		menu2off.src = "./photo/6.jpg";
		menu3on  = new Image();		menu3on.src  = "./photo/7_2.jpg";
		menu3off = new Image();		menu3off.src = "./photo/7.jpg";
		menu4on  = new Image();		menu4on.src  = "./photo/8_2.jpg";
		menu4off = new Image();		menu4off.src = "./photo/8.jpg";
		menu5on  = new Image();		menu5on.src  = "./photo/9_2.jpg";
		menu5off = new Image();		menu5off.src = "./photo/9.jpg";
		}

function img_act(imgName) {
	if (version >= 3) {
		var imgOn = eval(imgName + "on.src");
		document [imgName].src = imgOn;
		}
	}

function img_inact(imgName) {
	if (version >= 3) {
		var imgOff = eval(imgName + "off.src");
		document [imgName].src = imgOff;
		}
	}