If you want to see a track (which is uploaded on OSM) on an OSM background, just call:
http://www.emplexity.eu/osm_track_on_map.php/?id=xxxxxxx by replacing xxxxxxx with the OSM id of the track you want to visualize.

You may want to have a glimpse of what it looks like at www.emplexity.eu and click on the OSM icons attached to the cycle rides.

I felt the need to develop this php/javascript/openlayers script from bits and pieces I found around on the internet as I have not found such a ready made function on the web.

Hope you will find this useful.