function MssPlayText(introText) {
  var selectedText = "";

  if (window.top.getSelection)
    selectedText = window.top.getSelection();
  else if (window.top.document.getSelection)
    selectedText = window.top.document.getSelection();
  else if (window.top.document.selection)
    selectedText = window.top.document.selection.createRange().text;

  if (selectedText == "")
    selectedText = introText;

  MIKROV_PlayText(selectedText);
}