Openlayers Track example doesn't works

General talk
1

I try to make an example of Openlayers Track but it doesn’t works. I followed the example of this link: http://wiki.openstreetmap.org/wiki/Openlayers_Track_example

And that’s my code:

var lgpx = new OpenLayers.Layer.Vector("Vallter_Nuria_8_2011", {
	strategies: [new OpenLayers.Strategy.Fixed()],
	protocol: new OpenLayers.Protocol.HTTP({
                   
		url: "http://www.openstreetmap.org/user/marcrovira/traces/Vallter_Nuria_8_2011.gpx",  //I don't now what's the path. That tarck in the OSM Server.
		format: new OpenLayers.Format.GPX()
	}),
	style: {strokeColor: "green", strokeWidth: 5, strokeOpacity: 0.5},
	projection: new OpenLayers.Projection("EPSG:4326")
});
map.addLayer(lgpx);

Thanks everybody!!