// xGetElementById r2, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

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;
}

// xDef r1, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

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

// xStr r1, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

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

// xDisplay r3, Copyright 2003-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

// This was alternative 1:

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;
}

// xVisibility r1, Copyright 2003-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

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 xVisibility(e,s)
//{
//  if(!(e=xGetElementById(e))) return null;
//  var v = 'visible', h = 'hidden';
//  if(e.style && xDef(e.style.visibility)) {
//    if (xDef(s)) {
//      // try to maintain backwards compatibility (???)
//      if (xStr(s)) e.style.visibility = s;
//      else e.style.visibility = s ? v : h;
//    }
//    return e.style.visibility;
//    // or...
//    // if (e.style.visibility.length) return e.style.visibility;
//    // else return xGetComputedStyle(e, 'visibility');
//  }
//  else if (xDef(e.visibility)) { // NN4
//    if (xDef(s)) {
//      // try to maintain backwards compatibility
//      if (xStr(s)) e.visibility = (s == v) ? 'show' : 'hide';
//      else e.visibility = s ? v : h;
//    }
//    return (e.visibility == 'show') ? v : h;
//  }
//  return null;
//}

// xShow r3, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xShow(e) {return xVisibility(e,1);}

// xHide r3, Copyright 2001-2007 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xHide(e){return xVisibility(e,0);}