var editor;

   function editor_start() {
    editor = document.getElementById('editor');
    editor.contentWindow.document.designMode='on';
   }

   function editor_format(command, value) {
    editor.contentWindow.document.execCommand(command, false, value);
   }

   function editor_odeslat(host) {
    window.location.href = host + '&text='
    + encodeURIComponent(editor.contentWindow.document.body.innerHTML);
   }

  function editor_znaku(id_status){
   var delka;
   var status=document.getElementById(id_status);

   delka=encodeURIComponent(editor.contentWindow.document.body.innerHTML);
 	 status.innerHTML='Pocet znaku: <b>'+delka.length+'</b>';
  }