var mapimage = "includes/imgs/gmap.png";
		var ajaxurl = "includes/ajax/ajax_serve.php"; // url of the ajax server
		var iconpath = "includes/imgs/icon/"; // url of icon folder (most found at http://labs.google.com/ridefinder/images/
		var thumbnailurl = "thumbnail.php"; // url of thumbnail.php file
		var homeurl = "index.php"; // path of the main map site
		
var map = null; // google map object
var timeoutholder = null; // timeouts - wait between keypresses
var timeoutholder2 = null; //timeouts - wait between clicks
var infoWindows = []; // array to hold the contents of the markers
var gmarkers = []; // array to hold markers
var groundOverlay = null; // holds image that is overlayed over the tiles

function onLoad() {
	if (GBrowserIsCompatible()) {
		map = new GMap2(document.getElementById("map"));

		var pointCenter = new GLatLng(32.2829422129357, -106.747756004334);
		map.setCenter(pointCenter, 17, G_NORMAL_MAP);

		/*
		var pointSW = new GLatLng(32.269925, -106.762181);
		var pointNE = new GLatLng(32.286226, -106.737478);
		*/

		var pointSW = new GLatLng(32.269825, -106.762015);
		var pointNE = new GLatLng(32.28618, -106.737542);

		var mapBounds = new GLatLngBounds(pointSW, pointNE);

		groundOverlay = new GGroundOverlay(mapimage, mapBounds);
		map.addOverlay(groundOverlay);

		// To improve performance for panning, we want to hide the NMSU image and then show it again when we stop.
		GEvent.addListener(map,"dragstart", function(){layerToggle(false)});
		GEvent.addListener(map,"movestart", function(){layerToggle(false)});
		GEvent.addListener(map,"zoomstart", function(){layerToggle(false)});
		GEvent.addListener(map,"dragend",  function(){layerToggle(true)});
		GEvent.addListener(map,"moveend",  function(){layerToggle(true)});
		GEvent.addListener(map,"zoomend",  function(){layerToggle(true)});

		map.addControl(new GMapTypeControl());
		map.addControl(new GSmallMapControl());
		// add additional zoom options
		map.enableDoubleClickZoom();
		map.enableContinuousZoom();
		map.enableScrollWheelZoom();

		// add listener for when user clicks the map
		GEvent.addListener(map, 'click', setMarker);
	}
	else
		document.getElementById("map").innerHTML = "We are sorry, but your browser is not compatible with NMSU maps.";
}

// Shows/hides the NMSU map image when panning is involved.
function layerToggle(show) {
	if (show == true)
		groundOverlay.show();
	else
		groundOverlay.hide();
}

function setMarker(overlay, point) {
	if (overlay == null) {
		var lat = point.lat();
		var lng = point.lng();
	
		var overlays = getOverlays();
		for (var i in overlays) {
			if (overlays[i].type == 'click') {
				removeMarker(overlays[i]);
				break;
			}
		}
	
		var cm = new createMarker('click0', 'click', lat, lng, "mm_20_orange.png");
		cm.writeMarker();
		
		document.getElementById("coords").value = lat + ", " + lng;
	}
}

// add a marker to the map
function createMarker(id, type, lat, lng, iconurl) {
	this.id = id;
	this.type = type;
	this.lat = lat;
	this.lng = lng;
	this.iconurl = iconurl;

	var point = new GLatLng(this.lat, this.lng);

	var icon = new GIcon();
	if (this.iconurl != "")
		icon.image = iconpath + this.iconurl;
	else
		icon.image = iconpath + "mm_20_red.png";

	icon.shadow = iconpath + "mm_20_shadow.png";
//	icon.iconSize = new GSize(12, 20);
	icon.shadowSize = new GSize(22, 20);
	icon.iconAnchor = new GPoint(6, 20);

	var marker = new GMarker(point, icon);

	this.writeMarker = function() {
							var index = this.id;

							marker.type = this.type; // classes, build, perma, etc
							marker.id = index; // build0, bulid1, etc
							map.addOverlay(marker);
							gmarkers[index] = marker;
						};
}

// remove marker from the map
function removeMarker(overlay) {
	gmarkers[overlay.id] = '';  // BUGBUG: using null totally breaks the app, no idea why
	GEvent.clearListeners(overlay, "click");
	map.removeOverlay(overlay);
}

// return all markers on the map
function getOverlays() {
	return gmarkers;
}

// Try to free up some memory when the page exits
function onUnload() {
	var overlays = getOverlays();
	for (var i in overlays)
		removeMarker(overlays[i]);
	GUnload();
}