function transfOpacity(objT,startT,endT,stepT){
if (!document.getElementById) return;
containerobj=document.getElementById(objT);
if (startT = "x"){
  if (browserdetect=="mozilla"){
    startT=containerobj.style.MozOpacity*100;
  }else if (browserdetect=="ie"){
    startT= containerobj.filters.alpha.opacity;
  }
}
startT += stepT;
if ((stepT>0 && (endT+stepT)>startT)||(0>stepT  && startT>(endT+stepT))){
  if (browserdetect=="mozilla"){
    containerobj.style.MozOpacity=startT/100;
  }else if (browserdetect=="ie"){
    containerobj.style.filter = "alpha(opacity:"+startT+")";
  }
  timerT=window.setTimeout("transfOpacity('"+objT+"',"+startT+","+endT+","+stepT+")", 10);
}else{
  clearTimeout(timerT);
  return;
}
}