function xGetElementById(e)
{
  if(typeof(e)=='string') {
    if(document.getElementById) e=document.getElementById(e);
    else if(document.all) e=document.all[e];
    else e=null;
  }
  return e;
}

function xDisplay(e,s)
{
  if ((e=xGetElementById(e)) && e.style && xDef(e.style.display)) {
    if (xStr(s)) {
      try { e.style.display = s; }
      catch (ex) { e.style.display = ''; } // Will this make IE use a default value
    }                                      // appropriate for the element?
    return e.style.display;
  }
  return null;
}

function xVisibility(e, bShow)
{
  if(!(e=xGetElementById(e))) return null;
  if(e.style && xDef(e.style.visibility)) {
    if (xDef(bShow)) e.style.visibility = bShow ? 'visible' : 'hidden';
    return e.style.visibility;
  }
  return null;
}

function xDef()
{
  for(var i=0; i<arguments.length; ++i){if(typeof(arguments[i])=='undefined') return false;}
  return true;
}

function xHide(e)
{
 var element;
 element=xGetElementById(e);
 element.style.display='none';
 return xVisibility(e,0);
}

function xShow(e) 
{
 var element;
 element=xGetElementById(e);
 element.style.display='block';
 return xVisibility(e,1);
}

function xStr(s)
{
  for(var i=0; i<arguments.length; ++i){if(typeof(arguments[i])!='string') return false;}
  return true;
}