When using a modal window such as lightbox or shadowbox to display a post's images, client would like to be able to choose the background color that would be used for the modal window according to the image to be shown: color would be either black, white or grey.
I'm thinking such hack should be done via a plugin but i didn't find any, so i guess i should do it myself. It scarces me a bit: where should i store the chosen value? What hooks ? Any help would be welcome.