var idx;
var buff;
var xdim = 3;
var ydim = 3;

if (((navigator.appName == "Netscape")
	&& (parseInt(navigator.appVersion) >= 5 ))
	|| ((navigator.appName == "Microsoft Internet Explorer")
	&& (parseInt(navigator.appVersion) >= 4 ))) {
		version = "supported";
	} else {
		version = "notsupported";
}

if (version == "supported") {
  images = new Array();
  for (var i = 1; i <= ydim; i++) {
    for (var j = 1; j <= xdim; j++) {
      idx = "" + i + j;
      images[idx] = new Image();	// Create an Image object
      images[idx].src = "bot" + idx + ".gif";	// Specify URL to load
    }
  }
}
 
function imageToggle(idx1, idx2) {
  if (version == "supported") {
    var imgID = xdim*(idx1 - 1) + idx2 - 1 + imgOffset;
    var gridID = "" + idx1 + idx2;
    buff = document.images[imgID].src;
    document.images[imgID].src = images[gridID].src;
    images[gridID].src = buff;
  }
}