// functions for manipulating the image buttons on the nav bar.
// These are also used for "dynamic" image buttons elsewhere.
function
MM_preloadImages ()
{				//v3.0
  var d = document;
  if (d.images)
    {
      if (!d.MM_p)
	d.MM_p = new Array ();
      var i, j = d.MM_p.length, a = MM_preloadImages.arguments;
      for (i = 0; i < a.length; i++)
	if (a[i].indexOf ("#") != 0)
	  {
	    d.MM_p[j] = new Image;
	    d.MM_p[j++].src = a[i];
	  }
    }
}

function
MM_findObj (n, d)
{				//v4.0
  var p, i, x;
  if (!d)
    d = document;
  if ((p = n.indexOf ("?")) > 0 && parent.frames.length)
    {
      d = parent.frames[n.substring (p + 1)].document;
      n = n.substring (0, p);
    }
  if (!(x = d[n]) && d.all)
    x = d.all[n];
  for (i = 0; !x && i < d.forms.length; i++)
    x = d.forms[i][n];
  for (i = 0; !x && d.layers && i < d.layers.length; i++)
    x = MM_findObj (n, d.layers[i].document);
  if (!x && document.getElementById)
    x = document.getElementById (n);
  return x;
}

function
MM_nbGroup (event, grpName)
{				//v3.0
  var i, img, nbArr, args = MM_nbGroup.arguments;
  if (event == "init" && args.length > 2)
    {
      if ((img = MM_findObj (args[2])) != null && !img.MM_init)
	{
	  img.MM_init = true;
	  img.MM_up = args[3];
	  img.MM_dn = img.src;
	  if ((nbArr = document[grpName]) == null)
	    nbArr = document[grpName] = new Array ();
	  nbArr[nbArr.length] = img;
	  for (i = 4; i < args.length - 1; i += 2)
	    if ((img = MM_findObj (args[i])) != null)
	      {
		if (!img.MM_up)
		  img.MM_up = img.src;
		img.src = img.MM_dn = args[i + 1];
		nbArr[nbArr.length] = img;
	      }
	}
    }
  else if (event == "over")
    {
      document.MM_nbOver = nbArr = new Array ();
      for (i = 1; i < args.length - 1; i += 3)
	if ((img = MM_findObj (args[i])) != null)
	  {
	    if (!img.MM_up)
	      img.MM_up = img.src;
	    img.src = (img.MM_dn && args[i + 2]) ? args[i + 2] : args[i + 1];
	    nbArr[nbArr.length] = img;
	  }
    }
  else if (event == "out")
    {
      for (i = 0; i < document.MM_nbOver.length; i++)
	{
	  img = document.MM_nbOver[i];
	  img.src = (img.MM_dn) ? img.MM_dn : img.MM_up;
	}
    }
  else if (event == "down")
    {
      if ((nbArr = document[grpName]) != null)
	for (i = 0; i < nbArr.length; i++)
	  {
	    img = nbArr[i];
	    img.src = img.MM_up;
	    img.MM_dn = 0;
	  }
      document[grpName] = nbArr = new Array ();
      for (i = 2; i < args.length - 1; i += 2)
	if ((img = MM_findObj (args[i])) != null)
	  {
	    if (!img.MM_up)
	      img.MM_up = img.src;
	    img.src = img.MM_dn = args[i + 1];
	    nbArr[nbArr.length] = img;
	  }
    }
}

function
MM_swapImgRestore ()
{				//v3.0
  var i, x, a = document.MM_sr;
  for (i = 0; a && i < a.length && (x = a[i]) && x.oSrc; i++)
    x.src = x.oSrc;
}

function
MM_swapImage ()
{				//v3.0
  var i, j = 0, x, a = MM_swapImage.arguments;
  document.MM_sr = new Array;
  for (i = 0; i < (a.length - 2); i += 3)
    if ((x = MM_findObj (a[i])) != null)
      {
	document.MM_sr[j++] = x;
	if (!x.oSrc)
	  x.oSrc = x.src;
	x.src = a[i + 2];
      }
}