<!-- //begin javascript rollover code
  if (document.images)
   {
     port_off= new Image(23,132);
     port_off.src="/images/nav_port_off.gif";
     port_on= new Image(23,132);
     port_on.src="/images/nav_port_on.gif";
	 
     who_off= new Image(23,132);
     who_off.src="/images/nav_who_off.gif";
     who_on= new Image(23,132);
     who_on.src="/images/nav_who_on.gif";

     how_off= new Image(23,132);
     how_off.src="/images/nav_how_off.gif";
     how_on= new Image(23,132);
     how_on.src="/images/nav_how_on.gif";

 }

function change1(picName,imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + ".src");
      document[picName].src= imgOn;
    }
 }
// end javascript rollover code-->