function about() {
  alert(
    "You can use the following operators:\n\n" +
    "  Multiply *\n" +
    "  Add      +\n" +
    "  Divide   /\n" +
    "  Subtract -\n" +
    "  Power    ^\n\n" +
    "You can use (parentheses to (set (precedence)))." +
    "You can also type 'clear' without the quotes to clear the screen."
    );
  return false;
}