if (document.images)   {
//image 1
     image1on = new Image();
     image1on.src="./images/main-clover/clover_01.png";

     image1off = new Image();
     image1off.src = "./images/main-clover/clover_01-inactive.png";
//end image 1

//image 2
     image2on = new Image();
     image2on.src="./images/main-clover/clover_03.png";

     image2off = new Image();
     image2off.src = "./images/main-clover/clover_03-inactive.png";
//end image 2

//image 3
     image3on = new Image();
     image3on.src="./images/main-clover/clover_05.png";

     image3off = new Image();
     image3off.src = "./images/main-clover/clover_05-inactive.png";
//end image 3

//image 4
     image4on = new Image();
     image4on.src="./images/main-clover/clover_07.png";

     image4off = new Image();
     image4off.src = "./images/main-clover/clover_07-inactive.png";
//end image 4

}

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");
     }
}