document.addEventListener("DOMContentLoaded", function(event) {
  // Select the node that will be observed for mutations
  var parentOfMyList = document.body;

  // Options for the observer (which mutations to observe)
  var config = {
    attributes: true,
    childList: true,
    subtree: true
  };

  // Callback function to execute when mutations are observed
  var callback = function(mutationsList) {
    for (var mutation of mutationsList) {
      if (mutation.type == 'childList') {

        if (document.getElementById("topcmm-123flashchat-main-toolbar-message-type-option")!= null) {
            var elt = document.getElementById("topcmm-123flashchat-main-toolbar-message-type-option");
            setTimeout(elt.click.bind(elt), 2000);
          if (document.getElementById("topcmm-123flashchat-toolbar-style-send-sound-btn")!= null) {
            var clic2 = document.getElementById("topcmm-123flashchat-toolbar-style-send-sound-btn");
            setTimeout(clic2.click.bind(clic2), 2100);
          if (document.getElementById("topcmm-123flashchat-send-message-panel-close-icon")!= null) {
            var clic3 = document.getElementById("topcmm-123flashchat-send-message-panel-close-icon");
            setTimeout(clic3.click.bind(clic3), 2200);

//execute some function
        }
        }
        }
      }
    }
  };

  // Create an observer instance linked to the callback function
  var observer = new MutationObserver(callback);
  observer.observe(parentOfMyList, config);
});