Slet via button og ikke submit.

JScript kode 

 $().toasty({
                         message: "Fjerner billedet helt",
                         autoHide: 3000
                     });

JScript kode 

 <script type="text/javascript" language="javascript">
 // <![CDATA[
 // load jquery here before calling this
 $(document).ready(function() {
  
     // delete the entry once we have confirmed that it should be deleted
     $('.delete').click(function() {
         var parent = $(this).closest('tr');
         $.ajax({
             type: 'get',
             url: '?side=config/adminsider/slideshow/sletfoto', // <- replace this with your url here
             data: 'ajax=1&delete=' + $(this).attr('id'),
             beforeSend: function() {
                 parent.animate({'backgroundColor':'#000'},300);
             },
             success: function() {
                 parent.fadeOut(300,function() {
                 
                     $().toasty({
                         message: "Fjerner billedet helt",
                         autoHide: 3000
                         
                     });
                     parent.remove();
                 });
             }
         });        
     });
     // confirm that it should be deleted
     $('.delete').confirm({
     
         msg:'Er du sikker? ',
         timeout:3000
     });    
     
 });
 // ]]></script>