HTML Javascript popup window

<SCRIPT TYPE="text/javascript">
<!--
  function popup(mylink, windowname) {
    if (! window.focus)return true;
    var href;
    if (typeof(mylink) == 'string'){
      href=mylink;
    else
      href=mylink.href;
      window.open(href, windowname, 'width=400,height=200,scrollbars=yes');
      return false;
    }
  }
//-->
</SCRIPT>

<A HREF="popupbasic.html" onClick="return popup(this, 'notes')">my popup</A>

References:

http://www.htmlcodetutorial.com/linking/linking_famsupp_72.html