if (document.images) {
  HomeOn = new Image();     HomeOn.src = "images/home-over.jpg";
  HomeOff = new Image();    HomeOff.src = "images/home.jpg";
  AboutOn = new Image();     AboutOn.src = "images/aboutus-over.jpg";
  AboutOff = new Image();    AboutOff.src = "images/aboutus.jpg"; 
  ContactOn = new Image();     ContactOn.src = "images/contactus-over.jpg";
  ContactOff = new Image();    ContactOff.src = "images/contactus.jpg";
  GrowingOn = new Image();     GrowingOn.src = "images/growing-over.jpg";
  GrowingOff = new Image();    GrowingOff.src = "images/growing.jpg";
  RaspberryOn = new Image();     RaspberryOn.src = "images/raspberries-over.jpg";
  RaspberryOff = new Image();    RaspberryOff.src = "images/raspberries.jpg"; 
  BlackberryOn = new Image();     BlackberryOn.src = "images/blackberries-over.jpg";
  BlackberryOff = new Image();    BlackberryOff.src = "images/blackberries.jpg"; 
  StrawberryOn = new Image();     StrawberryOn.src = "images/strawberries-over.jpg";
  StrawberryOff = new Image();    StrawberryOff.src = "images/strawberries.jpg"; 
  BlueberryOn = new Image();     BlueberryOn.src = "images/blueberries-over.jpg";
  BlueberryOff = new Image();    BlueberryOff.src = "images/blueberries.jpg";
  MixedberryOn = new Image();    MixedberryOn.src = "images/mixedberries-over.jpg";
  MixedberryOff = new Image();    MixedberryOff.src = "images/mixedberries.jpg";
}
  
function imgOn(imgName){
  document.getElementById(imgName).src = eval(imgName + "On.src");
}

function imgOff(imgName){
  document.getElementById(imgName).src = eval(imgName + "Off.src");
}