function changeOpac(opacity, id) {
  var object = document.getElementById(id).style;
  object.opacity = (opacity / 100);
  object.MozOpacity = (opacity / 100);
  object.KhtmlOpacity = (opacity / 100);
  object.filter = "alpha(opacity=" + opacity + ")";
}
function imgupd(imgid) {
  document.getElementById(imgid).src='imgrot.php?'+microtime_calc();
  setTimeout("imgupd('imgrot1');",1000);
}
function microtime_calc() {
  var dt=new Date();
  return dt.getTime();
}

function fader(idn,ido,delay,speed) {
  changeOpac(0,idn);
  document.getElementById(idn).style.zIndex=1;
  document.getElementById(ido).style.zIndex=0;
  var steps=10;
  for (i=0;i<=steps;i++) {
    var j = i*(100/steps);
    setTimeout("changeOpac(" + j + ",'" + idn + "')",j*speed);
  }
  setTimeout("document.getElementById('"+ido+"').src='/imgrot.php?'+microtime_calc();",j*speed);
  setTimeout("fader('"+ido+"','"+idn+"',"+delay+","+speed+")",delay+(100*speed));

}