function getSel() {
  var txt = '';
  if (window.getSelection) {
    txt = window.getSelection();
  } else if (document.getSelection) {
    txt = document.getSelection();
  } else if (document.selection) {
    txt = document.selection.createRange().text;
  }
  return txt;
}

function insertAtCursor(myField, myValue) {
  //IE support
  if (document.selection) {
    myField.focus();
    sel = document.selection.createRange();
    sel.text = myValue;
  }
  //MOZILLA/NETSCAPE support
  else if (myField.selectionStart || myField.selectionStart == '0') {
    var startPos = myField.selectionStart;
    var endPos = myField.selectionEnd;
    myField.value = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
  } else {
    myField.value += myValue;
  }
}

function quote(user) {
  var f = YAHOO.util.Dom.get('msg');
  if (!f) {
    alert('Sorry, this function can only be used on the last page of a topic.');
  } else {
    var q = '\n[quote='+user+']'+getSel()+'[/quote]\n';
    insertAtCursor(f, q);
    f.focus();
  }
}