Keypress case number?

Keypress case number?

Hey Guys, I am trying to make a keypress website, but I need a case number for keys, such as
// user presses the "a"
         case 97:   showViaKeypress("#home");
                  break;   


Where can I find the "case" numbers for letters?
I have searched all over and I have not found anything, I need the case numbers for "D", "F", "G", and "H".

Thank You!!!