the following files belong together (they just have been splitted)
http://www.swat-portal.com/portal/images/cf18/coalsys1.avi
http://www.swat-portal.com/portal/images/cf18/coalsys2.avi
http://www.swat-portal.com/portal/images/cf18/coalsys3.avi
http://www.swat-portal.com/portal/images/cf18/coalsys4.avi