= form_tag compare_path(@project, @name), name: "compare-versions", id: "version-form" do
  %table.wiki{cellpadding: "0", cellspacing: "0"}
    - @versions.each do |v|
      %tr.history
        %td.td1
          %span#niceCheckbox1.niceCheck-main{onclick: "changeCheck(this)"}
            / = check_box_tag "versions[]", v.id, html: {class: 'history_cbx'}
            %input{type: 'checkbox', id: 'versions_', name: 'versions[]', value: v.id, class: 'history_cbx'}
        %td.td2
          - user = User.where(email: v.author.email).first
          .avatar
            = link_to user_path_by_user(user) do
              = image_tag avatar_url_by_email(v.author.email), alt: "avatar: #{v.author.name}", class: 'mini-gravatar'
          .name
            = link_to user_path_by_user(user) do
              %span.username= user.present? ? user.fullname : v.author.name
          .both
        %td.td3
          = datetime_moment v.committed_date, tag: :span, class: 'wiki-gray'
          = v.message
          - if @name
            = raw "[#{link_to v.id[0..6], versioned_project_wiki_path(@project, escaped_name, v.id), title: t("wiki.view_commit")}]"
          - else
            = "[#{v.id[0..6]}]"

:javascript
  $('.niceCheck-main').click(function() {
    var count = 0;
    $('input.history_cbx').each(function(i,el) {
      if ($(el).attr('checked')) {
        count = count + 1;
      }
    });
    if (count > 2) {
      var cbx = $( $(this).find('input.history_cbx')[0] );
      if ( cbx.attr('checked') ) {
        $(this).css('background-position', '0pt 0px');
        cbx.removeAttr('checked');
      }
    }
  });