source: sipes/modules_contrib/captcha/captcha.js @ 6e81fb4

// Javascript behaviors for general CAPTCHA functionality.
Drupal.behaviors.captcha = function (context) {

  // Turn off autocompletion for the CAPTCHA response field.
  // We do it here with Javascript (instead of directly in the markup)
  // because this autocomplete attribute is not standard and
  // it would break (X)HTML compliance.
  $("#edit-captcha-response").attr("autocomplete", "off");

};


// JavaScript behaviors for the CAPTCHA admin page
Drupal.behaviors.captchaAdmin = function (context) {

        // Add onclick handler to checkbox for adding a CAPTCHA description
        // so that the textfields for the CAPTCHA description are hidden
        // when no description should be added.
        $("#edit-captcha-add-captcha-description").click(function() {
                if ($("#edit-captcha-add-captcha-description").is(":checked")) {
                        // Show the CAPTCHA description textfield(s).
                        $("#edit-captcha-description-wrapper").show("slow");
                }
                else {
                        // Hide the CAPTCHA description textfield(s).
                        $("#edit-captcha-description-wrapper").hide("slow");
                }
        });
        // Hide the CAPTCHA description textfields if option is disabled on page load.
        if (!$("#edit-captcha-add-captcha-description").is(":checked")) {
                $("#edit-captcha-description-wrapper").hide();
        }

};