Add a toggle button for the filmstrip in the bottom toolbar.

bottom_toolbar.js

         ContactList.toggleContactList();
     };
 
+    my.toggleFilmStrip = function() {
+        $("#remoteVideos").toggleClass("hidden");
+    };
+
 
     $(document).bind("remotevideo.resized", function (event, width, height) {
         var bottom = (height - $('#bottomToolbar').outerHeight())/2 + 18;

css/font.css

 .icon-reload:before {
     content: "\e618";
 }
+.icon-filmstrip:before {
+    content: "\e619";
+}

css/videolayout_default.css

     width:auto;
     border:1px solid transparent;
     z-index: 5;
+    -webkit-transition: bottom 2s; /* For Safari 3.1 to 6.0 */
+    transition: bottom 2s;
+}
+
+#remotevideos.hidden {
+    bottom: -196px;
 }
 
 .videocontainer {

fonts/jitsi.svg

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 </font></defs></svg>

index.html

                     <a class="bottomToolbarButton" data-toggle="popover" data-placement="top" data-content="Open / close chat" onclick='BottomToolbar.toggleChat();'>
                         <i id="chatBottomButton" class="icon-chat-simple"></i>
                     </a>
-                    <span id="unreadMessages"></span>
                 </span>
                 <span class="bottomToolbar_span">
                     <a class="bottomToolbarButton" data-toggle="popover" data-placement="top" data-content="Open / close contact list" onclick='BottomToolbar.toggleContactList();'>
                         <i id="contactListButton" class="icon-contactList"></i>
                     </a>
-                    <span id="unreadMessages"></span>
+                </span>
+                <span class="bottomToolbar_span">
+                    <a class="bottomToolbarButton" data-toggle="popover" data-placement="top" data-content="Show / hide filmstrip" onclick='BottomToolbar.toggleFilmStrip()'>
+                        <i id="filmStripButton" class="icon-filmstrip"></i>
+                    </a>
                 </span>
             </span>
         </div>