attribute color

[philipperunza]

hie
i have a product with four color
http://www.deco-orientale.com/index....arocain-detail

i would like that when i select a color in the list , a new image appear in the box  like in the example below

http://www.almoultazimoun.com/fr/mar...ntal-soie.html

i use a simple custom field - cart variant

should i create a product child and a generic variant child  to get this result
i don't use stock


salutation
philippe