relation between color and size

Hi,
I'm looking for an extension that selecting the color of a product gives me available sizes and the main image changes according to the selected color.
Thank you!

Do you mean like this?

http://ocextensions.co.uk/chain/shirt

Yes correct, but i would see the image for the color, no the write, is it possible?

I don't understand.

no the write

Do you mean "white" or "write"?

In the demo if you click on "red" in the second option the product image changes to red.

Is this not what you wanted?

I solved, thank you!