<!--  Copy this code into the HEAD of your HTML document  -->

<script language="JavaScript">
<!--  This script is available at www.codespy.com  -->
<!--

if (document.images)   {
     image1on = new Image();
     image1on.src="name of your "on" image";

     image1off = new Image();
     image1off.src = "name of your "off" image";

}

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");
     }
}

// -->

