bb0 = new Image(230, 340); bb0.src = "img/07bb0.gif";
bb1 = new Image(230, 340); bb1.src = "img/07bb1.gif";
bb2 = new Image(230, 340); bb2.src = "img/07bb2.gif";
bb3 = new Image(230, 340); bb3.src = "img/07bb3.gif";

function m_over(imgNo) {
    if (imgNo <= 1 ){
      n = Math.floor(Math.random()*10);
      if (n <= 5 ){
        document ["bb"].src = eval("bb1.src");
      } else {
        document ["bb"].src = eval("bb2.src");
      }
    } else {
      document ["bb"].src = eval("bb3.src");
    }
  return true;
}
function m_out(imgNo) {
    document ["bb"].src = eval("bb0.src");
  return true;
}