function objById(id)
{
  if (document.getElementById)
    var returnVar = document.getElementById(id);
  else if (document.all)
    var returnVar = document.all[id];
  else if (document.layers)
    var returnVar = document.layers[id];
  return returnVar;
}
function tvs(id,vis) {
  var e = objById(id);
  if (!vis)
  {
    if (isOldIe())
    {
      e.style.visibility = "hidden";    
      e.style.display = "none";
    }
    else
    {
      e.style.setProperty("visibility","hidden",null);    
      e.style.setProperty("display","none",null);
    }
  } else {
    if (isOldIe())
    {
      e.style.visibility = "visible";    
      e.style.display = "block";
    }
    else
    {  
      e.style.setProperty("visibility","visible",null);      
      e.style.setProperty("display","block",null); 
    }
  }
}
function isOldIe()
{
  if (navigator.appName=="Microsoft Internet Explorer"&&parseFloat(navigator.appVersion)<=6)
    return true;
  else
    return false;  
}