I would like to add something to have so that the O in OK would be underlined and if I press the command key? it would do the same thing as clicking the button.
See the main HTML Prompt in the macro Mirror Mirror Macro for an example. There's a bit more to it than just the prompt (study the header's JavaScript). Oh, and I used CSS to style the underline but you can just use HTML, too.
Yes, sorry about the format of the code. It's minimized to save space in the Keyboard Maestro plist file. Any number of site can unminimize it, I should have pointed out, so it can be read.