var preloadFlag	= false;
var orverimg	= [];

/* Header menu */
var imgroot		= "images/btn/";
var bnames		= ["home","about","lunch","dinner","stay","staff","access","activity","info"];
var bfimgs		= ["home-f","about-f","lunch-f","dinner-f","stay-f","staff-f","access-f","activity-f","../index/info-btn-f"];
var btimgs		= ["home-t","about-t","lunch-t","dinner-t","stay-t","staff-t","access-t","activity-t","../index/info-btn-t"];
var now			= bnames.length + 1;
var fext		= ".gif";

function newImage (arg) {
	var rslt;
	if (document.images) {
		rslt		= new Image();
		rslt.src	= arg;
		return rslt;
	} else {
		return false;
	}
}

function preloadImages() {
	if (document.images) {
		var i = 0;
		var j = 0;
		for(i=0; i<btimgs.length; i++) {
			orverimg[i]		= newImage(imgroot + btimgs[i] + fext);
		}
		preloadFlag = true;
	}
}

function changeImages(id, img) {
	if (document.images && (preloadFlag == true)) {
		document.getElementById(id).src = imgroot + img + fext;
	}
}

/* Header menu */
function mover(num) {
	num = eval(num);
	changeImages(bnames[num], btimgs[num]);
	return true;
}

function mout(num) {
	num = eval(num);
	if (num != now) {
		changeImages(bnames[num], bfimgs[num]);
	}
	return true;
}

function extWin (url, title, w, h) {
	if ((url != "") && (title != "")) {
		if ((w == 0) && (h == 0)) {
			window.open(url, title);
		} else {
			window.open(url, title, "width=" + w + ", height=" + h + ", scrollbars=yes, resizable=yes");
		}
	}
	return false;
}