if (document.images) {

    image1on = new Image();
  image1on.src = "images/m1a.gif";
  image1off = new Image();
  image1off.src = "images/m1.gif";
  
   image2on = new Image();
  image2on.src = "images/m2a.gif";
  image2off = new Image();
  image2off.src = "images/m2.gif";

  image4on = new Image();
  image4on.src = "images/m4a.gif";
  image4off = new Image();
  image4off.src = "images/m4.gif";

  image5on = new Image();
  image5on.src = "images/m5a.gif";
  image5off = new Image();
  image5off.src = "images/m5.gif";
  
  image6on = new Image();
  image6on.src = "images/m6a.gif";
  image6off = new Image();
  image6off.src = "images/m6.gif";

  image7on = new Image();
  image7on.src = "images/m7a.gif";
  image7off = new Image();
  image7off.src = "images/m7.gif";

  image8on = new Image();
  image8on.src = "images/m8a.gif";
  image8off = new Image();
  image8off.src = "images/m8.gif";

  image9on = new Image();
  image9on.src = "images/m9a.gif";
  image9off = new Image();
  image9off.src = "images/m9.gif";

  image10on = new Image();
  image10on.src = "images/m10a.gif";
  image10off = new Image();
  image10off.src = "images/m10.gif";

  image11on = new Image();
  image11on.src = "images/m11a.gif";
  image11off = new Image();
  image11off.src = "images/m11.gif";

  image12on = new Image();
  image12on.src = "images/m12a.gif";
  image12off = new Image();
  image12off.src = "images/m12.gif";

  image13on = new Image();
  image13on.src = "images/m13a.gif";
  image13off = new Image();
  image13off.src = "images/m13.gif";

  image14on = new Image();
  image14on.src = "images/m14a.gif";
  image14off = new Image();
  image14off.src = "images/m14.gif";

    image15on = new Image();
  image15on.src = "images/m15a.gif";
  image15off = new Image();
  image15off.src = "images/m15.gif";



 
  }

function turnOn(imageName) 
{
  if (document.images) 
  {
    document[imageName].src = eval(imageName + "on.src");
  }
}

function turnOff(imageName) 
{
  if (document.images)
   {
    document[imageName].src = eval(imageName + "off.src");
  }
}