function showdownload(uid) {
  var old_uid = document.getElementById('haendler_download_current_id').innerHTML;
  
  if (old_uid != '') {
    document.getElementById('img_'+old_uid).innerHTML = document.getElementById('img_no_'+old_uid).innerHTML;
    document.getElementById('img_bg_'+old_uid).className = 'haendler_download_paket_img_hg';
  } 
  
  document.getElementById('haendler_download_box_downloads').innerHTML = document.getElementById('download_'+uid).innerHTML;
  document.getElementById('img_'+uid).innerHTML = document.getElementById('img_act_'+uid).innerHTML;
  document.getElementById('img_bg_'+uid).className = 'haendler_download_paket_img_hg_act';
  document.getElementById('haendler_download_current_id').innerHTML = uid;
}