function GetTrinary(message, option1, option2, option3) {
  script = "" +
   "title = 'Three Doors';\n" +
   "message = '" + message + "';\n" +
   "option1 = '" + option1 + "';\n" +
   "option2 = '" + option2 + "';\n" +
   "option3 = '" + option3 + "';\n" +
   "options = [option1, option2, option3];\n" +
   "rval = javax.swing.JOptionPane.showOptionDialog(Packages.ij.IJ.getInstance(), message, title, javax.swing.JOptionPane.DEFAULT_OPTION, javax.swing.JOptionPane.QUESTION_MESSAGE, null, options, options[0]);\n" +
   "rval == javax.swing.JOptionPane.CLOSED_OPTION ? null : options[rval];\n";
   return eval("js", script);
}

answer = GetTrinary("Do you like green eggs and ham?", "yes", "no",
"sometimes");
print(answer);