//preload images for better viewing

if (document.images) {

  ref1_off     = new Image(50,50);
  ref1_off.src = "images/home_btn_off.jpg";
  ref1_on      = new Image(50,50);
  ref1_on.src  = "images/home_btn_on.jpg";

  ref2_off     = new Image(95,50);
  ref2_off.src = "images/about_btn_off.jpg";
  ref2_on      = new Image(95,50);
  ref2_on.src  = "images/about_btn_on.jpg";

  ref3_off     = new Image(103,50);
  ref3_off.src = "images/press_btn_off.jpg";
  ref3_on      = new Image(103,50);
  ref3_on.src  = "images/press_btn_on.jpg";

  ref4_off     = new Image(87,50);
  ref4_off.src = "images/media_btn_off.jpg";
  ref4_on      = new Image(87,50);
  ref4_on.src  = "images/media_btn_on.jpg";

  ref5_off     = new Image(77,50);
  ref5_off.src = "images/volunteer_btn_off.jpg";
  ref5_on      = new Image(77,50);
  ref5_on.src  = "images/volunteer_btn_on.jpg";

  ref6_off     = new Image(67,50);
  ref6_off.src = "images/contact_btn_off.jpg";
  ref6_on      = new Image(67,50);
  ref6_on.src  = "images/contact_btn_on.jpg";

  ref7_off     = new Image(280,51);
  ref7_off.src = "images/events_icon_off.jpg";
  ref7_on      = new Image(280,51);
  ref7_on.src  = "images/events_icon_on.jpg";

  ref8_off     = new Image(280,51);
  ref8_off.src = "images/yardsign_icon_off.jpg";
  ref8_on      = new Image(280,51);
  ref8_on.src  = "images/yardsign_icon_on.jpg";

  ref9_off     = new Image(280,51);
  ref9_off.src = "images/join_icon_off.jpg";
  ref9_on      = new Image(280,51);
  ref9_on.src  = "images/join_icon_on.jpg";

  ref10_off     = new Image(280,51);
  ref10_off.src = "images/donate_icon_off.jpg";
  ref10_on      = new Image(280,51);
  ref10_on.src  = "images/donate_icon_on.jpg";

}

//func() to handle mouseover
//imgOff is off image
//imgOn is on image
function rollOver(imgOff,imgOn) {

   if (document.images)
   {
       document.images[imgOff].src = eval(imgOn + ".src")
   }
}