function addImage(Image){
  var textarea=document.forms[1].tresc;
  
  var value=textarea.value + "<img src='" + Image + "' />";
  //alert(value);
  document.forms[1].tresc.value=value;
  //document.forms[1].tresc.value  = textarea + "<img src='" + Image + "'>";     
  }
  
function pokaz_plik(adres) {
druk = window.open(adres, '', 'menubar=no, toolbar=no, location=no, scrollbars=yes, resizable=no, status=no, width=700, height=420, left=30, top=30')
druk.focus()
return false;
}