Adds buttons to scroll the tabs when they overflow.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3174 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/common/_tabs.rhtml

@@ -9,8 +9,17 @@
                                     :onclick => "showTab('#{tab[:name]}'); this.blur(); return false;" %></li>
   <% end -%>
   </ul>
+  <div class="tabs-buttons" style="display:none;">
+  	<button class="tab-left" onclick="moveTabLeft(this);"></button>
+  	<button class="tab-right" onclick="moveTabRight(this);"></button>
+  </div>
 </div>
 
+<script>
+	Event.observe(window, 'load', function() { displayTabsButtons(); });
+	Event.observe(window, 'resize', function() { displayTabsButtons(); }); 
+</script>
+
 <% tabs.each do |tab| -%>
   <%= content_tag('div', render(:partial => tab[:partial], :locals => {:tab => tab} ), 
                        :id => "tab-content-#{tab[:name]}",