function closeModalWindow(myurl) {
  window.returnValue = '<a href="index.php?' + myurl + '"> zde vložte text odkazu </a>';
  window.close();
}

function storeCaret (textEl) {
  if (textEl.createTextRange) 
    textEl.caretPos = document.selection.createRange().duplicate();
}

function insertAtCaret (textEl, text) {
  if (textEl.createTextRange && textEl.caretPos) {
    var caretPos = textEl.caretPos;
    caretPos.text =
      caretPos.text.charAt(caretPos.text.length - 1) == ' ' ?
      text + ' ' : text;
  } else textEl.value  = text;
}