Redmine

  <tr>

    <td style="padding-left:0">

      <%= label_tag "available_columns", l(:description_available_columns) %>

      <%= select_tag 'available_columns',

              options_for_select((query.available_columns - query.columns).collect {|column| [column.caption, column.name]}),

              :multiple => true, :size => 10, :style => "width:150px" %>

    </td>

    <td>

      <%= label_tag "selected_columns", l(:description_selected_columns) %>

      <%= select_tag 'c[]',

              options_for_select(query.columns.collect {|column| [column.caption, column.name]}),

              :id => 'selected_columns', :multiple => true, :size => 10, :style => "width:150px" %>