var loaded = new Array();
function gbutton (image, onimage) {
  if (image && image.src && (image.out == null || typeof(image.out) == typeof(void(0)))) {
    s = image.src;
    image.out = new Image();
    image.out.src = s;
    image.over = new Image();
    image.over.src = onimage;
    loaded[image.name] = image;
  }
}

function roll (imagename, over) {
  if (document.images) {
    if (over) i = "over";
    else i = "out";
    image = loaded[imagename];
    if (image) image.src = eval("image."+i+".src");
  }
}