The older photos show a paint job with a white fuselage the newer ones show the light blue.
Old
http://www.airport-data.com/aircraft/photo/041586.html
New
http://www.airport-data.com/aircraft/photo/164587.html
Maybe it is a bit clearer in these pics from airliners.net
http://www.airliners.net/photo/Air-Canada/Airbus-A319-114/1198234/M/
http://www.airliners.net/photo/Air-Canada/Airbus-A319-114/1247567/M/
and here she is in another older livery...
http://www.airliners.net/photo/Air-Canada/Airbus-A319-114/0944025/M/
The difference I was referring to was that one picture was the white fuselage and two others were light blue...So a plane would get re-painted and keep the tail number? even though the appearance would change somewhat, to those with more knowledge of aircraft, to me its a big change but I guess its nothing big for you guys I am not familiar with aircraft and re-painting and all that So would it be very common for say this particular aircraft to be painted many times different colors?