Oki!!!!
Now I can redirect my customer to my custumization node. I created a content type called "custumisation". There is a field for the graphic and 2 others fields for the height and the width.
Now if I'm a custumer, I go to the products pages. I choose my product by cliking on the cart link. This item is added to the cart and I am redirected to the customization node. I upload the picture and I choose the height and the width.
If I clik on submit, A node is created, I can see my "customization". Now How do the admin knows where is the picture and what are the size settings? And more important, How does the cosumer get to his cart?
Thanks for your help.
Bee