// JavaScript Responsible for "AJAX" style window.
if (document.images) {
	room = new Image
	king = new Image
	north = new Image
	south = new Image
	southdx = new Image
	apt1 = new Image
	apt2 = new Image
	apt100 = new Image
	apt698 = new Image
	
	room.src = "images/room_image.jpg"
	king.src = "images/king.jpg"
	north.src = "images/north.jpg"
	south.src = "images/south.jpg"
	southdx.src = "images/south-deluxe.jpg"
	apt1.src = "images/214.jpg"
	apt2.src = "images/699.jpg"
	apt100.src = "images/100.jpg"
	apt698.src = "images/698.jpg"
	
}

function chgImg (imgField, newImg) {
	if (document.images) {
		document[imgField].src= eval(newImg+".src")
	}
}


function jah(url,target) {
    // native XMLHttpRequest object
    document.getElementById(target).innerHTML = 'Loading...';
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.onreadystatechange = function() {jahDone(target);};
        req.open("GET.html", url, true);
        req.send(null);
    // IE/Windows ActiveX version
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.onreadystatechange = function() {jahDone(target);};
            req.open("GET.html", url, true);
            req.send();
        }
    }
}    

function jahDone(target) {
    // only if req is "loaded"
    if (req.readyState == 4) {
        // only if "OK"
        if (req.status == 200) {
            results = req.responseText;
            document.getElementById(target).innerHTML = results;
        } else {
            document.getElementById(target).innerHTML="jah error:\n" +
                req.statusText;
        }
    }
}

var cur_lyr;	// holds id of currently visible layer
function swapLayers(id) {
  if (cur_lyr) hideLayer(cur_lyr);
  showLayer(id);
  cur_lyr = id;
}

function showLayer(id) {
  var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.visibility = "visible";
}

function hideLayer(id) {
  var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.visibility = "hidden";
}

function getElemRefs(id) {
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? document.layers[id]: null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}