var imgs = $('.poster-min img').eq(0).attr('src');
     $('.general').prepend('<a class="fancybox" rel="group" href="' + imgs + '"><img src="' + imgs + '" height="263" align="absbottom"></a>');
     $('.poster-min img').click(function() {
         $('.general').find('img').attr('src', $(this).attr('src'));
     });
     $('.poster-min li').eq(0).addClass('active');
     $('.poster-min li').click(function() {
         $('.poster-min li').removeClass('active');
         $(this).addClass('active');
     });

<div class="general">
<a class="fancybox" rel="group" href=""><img src="/app/289650/1.jpg" height="263" align="absbottom"></a>
</div>

<Window x:Class="Menu.MainWindow"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          Title="MainWindow" Height="480" Width="800">
      <Grid Margin="0,0,-8,-8">
          <TabControl HorizontalAlignment="Left" Height="357" Margin="271,29,0,0" VerticalAlignment="Top" Width="519">
              <TabItem Header="Выбор сервера">
                  <Grid Background="#FFE5E5E5">
                      <ScrollViewer HorizontalAlignment="Left" Height="262" Margin="10,10,0,0" VerticalAlignment="Top" Width="488">
                          <StackPanel Name="stackPanelButtons" Width="488" HorizontalAlignment="Left" VerticalAlignment="Top">
                    <Button Content="Общий сервер 001" Width="160" Height="76" Margin="2"></Button>
                    <Button Content="Общий сервер 002" Width="160" Height="76" Margin="2"></Button>
                    <Button Content="Общий сервер 003" Width="160" Height="76" Margin="2"></Button>
                    <Button Content="Общий сервер 004" Width="160" Height="76" Margin="2"></Button>
                    <Button Content="Общий сервер 005" Width="160" Height="76" Margin="2"></Button>
                    <Button Content="Общий сервер 006" Width="160" Height="76" Margin="2"></Button>
                          </StackPanel>
                      </ScrollViewer>
                      <Button Content="Обновить" HorizontalAlignment="Left" Height="42" Margin="410,277,0,0" VerticalAlignment="Top" Width="42"/>
                      <Button Content="Вход" HorizontalAlignment="Left" Height="42" Margin="457,277,0,0" VerticalAlignment="Top" Width="42"/>
                  </Grid>
              </TabItem>
          </TabControl>
      </Grid>
</Window>