On the "Games" tab, double click Counter-Strike. This will start up the game.
You need to convert the picture to a .wad file and name it tempdecal.wad. It must be a size divisble by 16. (ex: 16x16, 96x96, etc) Put the file into C:\Program Files\Valve\Steam\SteamApps\<username>\Counter-Strike\cstrike\ Then right click it, enter properties, and make it "read only". Now you can spray the picture inside the game.
Da Strike was created on 1994-12-16.
The Hunger Strike was created on 2008-03-16.
Crime Strike - 1999 2011-12-16 was released on: USA: 16 December 2011
Strike It Rich - 1951 1954-02-16 was released on: USA: 16 February 1954
Crime Strike - 1999 2013-09-16 was released on: USA: 16 September 2013
Crime Strike - 1999 2013-12-16 was released on: USA: 16 December 2013
Crime Strike - 1999 2012-03-16 was released on: USA: 16 March 2012
Crime Strike - 1999 2012-04-16 was released on: USA: 16 April 2012
Crime Strike - 1999 2012-07-16 was released on: USA: 16 July 2012
Air Strike - 2004 V is rated/received certificates of: Germany:16 (cut) Iceland:16 Netherlands:16 Singapore:NC-16 USA:R
The Strike - 1912 was released on: USA: 16 August 1912