//Grayscale Systems LLC

//Preload images
if (document.images) {
	 mainOn = new Image();
	 mainOn.src = "back_text.jpg";
	 mainOff = new Image();
	 mainOff.src = "back_g.jpg";
}
// on function
function activate(image_name) {
   if (document.images) {
   	  document[image_name].src = eval(image_name + "On.src");
  }
}
// off function
function deactivate(image_name) {
   if (document.images) {
   	  document[image_name].src = eval(image_name + "Off.src");
   }
}