[kml_flashembed movie="http://www.youtube.com/v/eGzrMHXdzjs" width="425" height="350" wmode="transparent" /]

Les presentacions que acompanyen la seva explicació:

[kml_flashembed movie="http://www.youtube.com/v/KeAY3JcM6d4" width="425" height="350" wmode="transparent" /]

[kml_flashembed movie="http://www.youtube.com/v/duzRtApYXDE" width="425" height="350" wmode="transparent" /]