function getMap() {	
      var options = {
          controls: [],  
          projection: "EPSG:4326",
          units: 'degrees'
      }; 	
	map = new OpenLayers.Map($('center'),options);   

	var jpl_wms = new OpenLayers.Layer.WMS(
			"NASA Global Mosaic",
			"http://t1.hypercube.telascience.org/cgi-bin/landsat7",
			{layers: "landsat7"}
		 );

 
	map.addLayers([jpl_wms]);	
	map.addControl(new OpenLayers.Control.PanZoom()); 
 	map.addControl(new OpenLayers.Control.Navigation()); 
	map.zoomToMaxExtent();
	map.zoomTo(2);
   return map;
}