for(var i=1;i<15;i++)

{

eval('b' + i + 'a = new Image(); b' + i + 'a.src = "/images/b' + i + 'a.gif";');

eval('b' + i + 'b = new Image(); b' + i + 'b.src = "/images/b' + i + 'b.gif";');

}

s1 = new Image; s1.src = "/images/point_w.gif";

s2 = new Image; s2.src = "/images/smaller_arrow.gif";



function imageOn(name){

  document.images[name].src = eval(name + 'b.src');

  document.images[name+'s'].src = eval('s2.src');

}



function imageOff(name){

  document.images[name].src = eval(name + 'a.src');

  document.images[name+'s'].src = eval('s1.src');

}