JavaScript OpenLayers Map With ESRI Tiles

gistfile1

var slrMap = {

	//default properties
	map : null,
	//class functions
	loadMap: function(){

			this.map = new OpenLayers.Map({
				div: "map",
				projection: "EPSG:900913"
			});

			this.map.addLayer(
				new OpenLayers.Layer.XYZ("esri", 'http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/${z}/${y}/${x}', {
					transitionEffect: "resize",
					sphericalMercator: true,
					format: "image/jpg"
			}));
			
			this.map.addLayer(
				new OpenLayers.Layer.XYZ("noaa", 'http://csc.noaa.gov/arcgis/rest/services/dc_slr/marsh_000/MapServer/tile/${z}/${y}/${x}', {
					transitionEffect: "resize",
					//sphericalMercator: true,
					format: "image/jpg",
					isBaseLayer : false,
					transparent : "true",
					opacity : 0.9
			}));
			
			this.map.addControl(new OpenLayers.Control.LayerSwitcher());
			this.map.setCenter(new OpenLayers.LonLat(-10670712.603429, 4605008.2646843), 4);
			//this._fetchEsriLayerData();
		},
};