var agent = navigator.userAgent;
var appver = navigator.appVersion;
var nav = navigator.appName;
var plf = null;
var ver = null;

if(agent.indexOf('Mac') != -1){
	plf = "Mac";
}else if(agent.indexOf('Win') != -1){
	plf = "Win";
}else{
	plf = "other";
}
if(agent.indexOf('MSIE') == -1){
	ver = appver.charAt(0);
	if(nav == "Netscape"){
		nav = "NN";
	}
}else{
	ver = agent.charAt(agent.indexOf('MSIE') + 5);
	nav = "MSIE";
}

var imageDir = "../images/";
var loadList;
var action = "off";

function preLoad() {
    loadList = new Array( "menu01_on.gif", "menu02a_on.gif", "menu02b_on.gif", "menu02_on.gif", "menu03_on.gif", "menu04_on.gif", "b_room01_on.gif", "b_room02_on.gif", "b_room03_on.gif");
    onImages = new Array();
    for (field in loadList){
        onImages[field] = new Image();
        onImages[field].src = imageDir + loadList[field];
    }
    action = "on";
}

function changeImage1 (fileName, imageName, fileName2, imageName2) {
	if (action == "on") {
		document.images[imageName].src = imageDir + fileName;
		document.images[imageName2].src = imageDir + fileName2;
	}
}

function changeImage2 (fileName, imageName) {
	if (action == "on") {
		document.images[imageName].src = imageDir + fileName;
	}
}