function greet()
{
  var now = new Date() ;
  var hour = now.getHours() ;
  var greeting = "" ;
  if ( hour < 12 )
    greeting = "Good morning..." ;
  else
  if ( hour < 17 )
    greeting = "Good afternoon..." ;
 else
    greeting = "Good evening..." ;

  document.write( greeting );
};

<!-- borrowed from Dreamweaver -->
function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}