if (typeof MooTools == 'undefined') {
	alert('MooTools is required for Mercurytide.GoogleMaps.');
} else {
	if (typeof Mercurytide == 'undefined') var Mercurytide = {};

	Mercurytide.GoogleMaps = {

		enabled: true,
		apiKey: null,
	
		required: false,
	
		domLoaded: false,
		loadCalled: false,
		apiLoaded: false,
	
		callbacks: [],
	
		loadIfRequired: function() {
			Mercurytide.GoogleMaps.domLoaded = true;
			if (Mercurytide.GoogleMaps.callbacks.length > 0) {
				Mercurytide.GoogleMaps.load();
			}
		},
	
		load: function() {
			if (!Mercurytide.GoogleMaps.enabled) return;
			if (Mercurytide.GoogleMaps.loadCalled) return;
			Mercurytide.GoogleMaps.loadCalled = true
		
			if (Mercurytide.GoogleMaps.apiKey == null) {
				alert('Mercurytide.GoogleMaps.apiKey has not been defined.');
			} else if (Mercurytide.GoogleMaps.apiKey == '') {
				alert('Mercurytide.GoogleMaps.apiKey is blank -- is ' + location.host + ' correctly configured?');
			} else {
				new Asset.javascript('http://maps.google.com/maps?file=api&v=2&key=' + Mercurytide.GoogleMaps.apiKey + '&async=2&callback=Mercurytide.GoogleMaps.loaded');
			}
		},
	
		loaded: function() {
			Mercurytide.GoogleMaps.apiLoaded = true;
			Mercurytide.GoogleMaps.callbacks.each(function(callback) {
				callback();
			});
			Mercurytide.GoogleMaps.callbacks = [];
		},
	
		whenLoaded: function(callback) {
			if (Mercurytide.GoogleMaps.apiLoaded) {
				callback();
			} else {
				Mercurytide.GoogleMaps.callbacks.push(callback);
				Mercurytide.GoogleMaps.required = true;
			}
			if (Mercurytide.GoogleMaps.domLoaded) Mercurytide.GoogleMaps.load();
		},
	
		/**
		 * Wrapper to the standard enableScrollWheelZoom function to ensure that
		 * the map container's scroll wheel event doesn't propogate and cause the
		 * whole page to scroll. 
		 */
		enableScrollWheelZoom: function(map) {
			map.enableScrollWheelZoom();
			var stop = function(e) { new Event(e).stop(); } 
			$(map.getContainer()).addEvent('DOMMouseScroll', stop);
			$(map.getContainer()).addEvent('mousewheel', stop); 
		}
	
	}

	window.addEvent('load', Mercurytide.GoogleMaps.loadIfRequired);
}