Remove broken javascript, also see upstream.

upstream: http://www.redmine.org/projects/redmine/repository/revisions/3559

app/views/meeting_contents/history.html.erb

@@ -17,8 +17,8 @@
 <% @content_versions.each_with_index do |content_version,index| %>
 <tr class="<%= cycle("odd", "even") %>">
     <td class="id"><%= link_to content_version.version, :action => 'show', :meeting_id => @meeting, :version => (content_version.version == @content.version ? nil : content_version.version) %></td>
-    <td class="checkbox"><%= radio_button_tag('version_to', content_version.version, (index==0), :id => "checkbox-#{index}", :onclick => "$('checkbox-to-#{index+1}').checked=true;") if show_diff && (index < @content_versions.size-1) %></td>
-    <td class="checkbox"><%= radio_button_tag('version_from', content_version.version, (index==1), :id => "checkbox-to-#{index}", :onclick => "if ($('checkbox-#{index}').checked==true || $('version_from').value > #{content_version.version}) {$('checkbox-#{index-1}').checked=true;}") if show_diff && (index > 0) %></td>
+    <td class="checkbox"><%= radio_button_tag('version_to', content_version.version, (index==0), :id => "checkbox-from-#{index}", :onclick => "$('checkbox-to-#{index+1}').checked=true;") if show_diff && (index < @content_versions.size-1) %></td>
+    <td class="checkbox"><%= radio_button_tag('version_from', content_version.version, (index==1), :id => "checkbox-to-#{index}") if show_diff && (index > 0) %></td>
     <td align="center"><%= format_time(content_version.updated_at) %></td>
     <td><em><%= content_version.author %></em></td>
     <td><%=h content_version.comment %></td>