add feature to use external buttons for opening the menu

ipick.js

@@ -140,6 +140,11 @@
   toggle.appendChild(image);
   menu.appendChild(toggle);
 
+  // search for external menu triggers
+  var trgs = document.getElementsByClassName("ipick-trigger-button");
+  for (var i in trgs)
+    trgs[i].onclick = openMenu;
+
   // add menu to the dom
   document.body.appendChild(menu);
   document.body.appendChild(backdrop);