function buttonMouseOver (button, dir) {
  if (button.disabled)
    return;
  name = button.id.substring (0, button.id.length - 1);  
  button.src = dir + "/" + name + "-roll.jpg";  
}

function buttonMouseOut (button, dir) {
  if (button.disabled)
    return;
  name = button.id.substring (0, button.id.length - 1);
  button.src = dir + "/" + name + ".jpg";  
}

function disableButtons (name, disable, dir) {
  var i;
  for (i = 1; i <= 2; i++) {
    var button = document.getElementById (name + i);
    if (button != null) {
      button.disabled = disable;
      button.src = dir + "/" + name + (disable ? "-off" : "") + ".jpg";
    }
  }
  
}

function enableButtons (name, dir) {
  var i;
  for (i = 1; i <= 2; i++) {
    var button = document.getElementById (name + i);
    if (button != null) {
        //pic = new Image(64, 24);
  		name = button.id.substring (0, button.id.length - 1);
  		//pic.src = "http://sgdev/" + dir + "/" + name + ".jpg";  		
  		button.src = dir + "/" + name + ".jpg";
    }
  }
}