var num_attachments = 1;

    //nastavit počet příloh
    function set_num_attachments(num_attachments_set)
    {
     num_attachments = num_attachments_set;
    }

    //přidání nové přílohy
    function add_attachment()
    {
     num_attachments++;
     var attachment_element = document.createElement('label');
     attachment_element.className = 'form_file_field';
     attachment_element.innerHTML = '<span>Soubor (max 4Mb): </span><input type="file" name="attachment'+num_attachments+'" value=""  />';
     
     document.getElementById('attachments_block').appendChild(attachment_element);

     document.getElementById('num_attachments_input').value = num_attachments;
    }

    //nastavit přílohy
    function set_num_attachments_visible(num_attachments_get)
    {
     if (num_attachments_get > num_attachments) {
      for (i = num_attachments; i < num_attachments_get; i++) {
    	  add_attachment();
      }
     }
    }