function changeImage(imageSrc, width, height) {
  document.center.height = height;
  document.center.width = width;
  document.center.src = imageSrc;
}

function CngTxt(id,txt){
 var obj=document.getElementById(id);
 if (txt){ obj.innerHTML = "<font color='white'>" + txt + "</font>"; }
 else {  obj.innerHTML='&nbsp;'; }
}