Function createButton

frameless-window/titlebar.js:18–32

(button_id, button_name, normal_image_url,
                       hover_image_url, click_func)

}

function createButton(button_id, button_name, normal_image_url,
                       hover_image_url, click_func) {
  var button = document.createElement("div");
  button.setAttribute("class", button_name);
  var button_img = createImage(button_id, normal_image_url);
  button.appendChild(button_img);
  button.onmouseover = function() {
    updateImageUrl(button_id, hover_image_url);
  }
  button.onmouseout = function() {
    updateImageUrl(button_id, normal_image_url);
  }
  button.onclick = click_func;
  return button;
}

function focusTitlebars(focus) {
  var bg_color = focus ? "#3a3d3d" : "#7a7c7c";