how to change the color of a macro button based on a sheet being present or not

i have a sheet with 260 macro buttons on it. the buttons are either "Add" or "Del" and basically the add button creates the sheet and populates it with some data, the Del deletes the sheet. the color of the Add button is green and the Del button is red. what i would like to do is have some code that greys out the Add button if the sheet does exist and greys out the Del button if the sheet doesnt exist. i have no code to work with as i dont even know how to program the buttons for this functionality. so is this possible to do?

here is the Add button for Sheet A

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here is the Del button for Sheet A

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thanks AlphaFrog and mehmetcik.

alphafrog, that is the ticket! works like a champ.

appreciate all the help.

i wish that i had seen this one before i made my 260 buttons, wah! much more elegant and less buttons. i appreciate all your help, i will have to see if i want to redo the page. but thanks again for going the extra mile.