//IE バージョン取得
function getBrowserVersion(){
	str = navigator.appName.toUpperCase();
	version = 0;
	appVer  = navigator.appVersion;
	if (str.indexOf("NETSCAPE") >= 0){
		s = appVer.indexOf(" ",0);
		version = eval(appVer.substring(0,s));
		if (version >= 5) version++;
	}
	if (str.indexOf("MICROSOFT") >= 0){
		appVer  = navigator.userAgent;
		s = appVer.indexOf("MSIE ",0) + 5;
		e = appVer.indexOf(";",s);
		version = eval(appVer.substring(s,e));
	}
	return version;
}

var vNum = getBrowserVersion();
var bName = navigator.appName.charAt(0);



// Preload
function preloadImages(){
	preloadFlag = 0;
	//ヘッダー用
	img_data = new Array(
/*   0   1   2   3   4   5   6   7   8   9  10  */
		"1","2","3","4","5","6","7","8"
	);

	img_data_on = new Array();
	img_data_off = new Array();

	for(i=0; i<img_data.length; i++){
		img_data_on[i] = new Image();
		img_data_on[i].src = "/images/nv" + img_data[i] + "b.gif";
		img_data_off[i] = new Image();
		img_data_off[i].src = "/images/nv" + img_data[i] + "a.gif";
	}
	
}
preloadImages();

if(preloadFlag != 1){
	preloadImages();
}

// Change Images
function offimage(i) {
	if (document.images) {
		document.images["img"+ i].src = img_data_off[i].src;
	}
}

function onimage(i) {
	if (document.images) {
		document.images["img"+ i].src = img_data_on[i].src;
	}
}