function imgswitch(id, src)
{
 new Effect.Appear(id, {duration: 2, from: 0.5, to: 1});
 imgsrc(id, src);
}

function imgsrc(id, imgname)
{
  if (document.getElementById)
  {
    var path = "./images/";
    var img = document.getElementById(id);
	img.src = path + imgname;
  }
}