tension controler for 12v led

hey!
in first sorry for my bad english ^^
in second, the idea is control the intensity of a 12v spot led with 2 button (more and less) but i've absulout no idea who i can doe that !

if someone have the solution :smiley:

12v spot led

Please post a link to the led. Please see the forum guide to find out how to post a link and make it clickable.