// resize fix for ns4
var origWidth, origHeight;
if (document.layers) {
    origWidth = window.innerWidth; origHeight = window.innerHeight;
    window.onresize = function() { if (window.innerWidth != origWidth || window.innerHeight != origHeight) history.go(0); }
}

var cur_lyr;    // holds id of currently visible layer

function showLayers() {
  args=showLayers.arguments;
  for (i=0;i<args.length;i++){
	  lyr = getElemRefs(args[i]);
	  if (lyr && lyr.css){
	   lyr.css.display = "block";

	   }
	}
}

function hideLayers() {
  args=hideLayers.arguments;
  for (i=0;i<args.length;i++){
  lyr = getElemRefs(args[i]);
  if (lyr && lyr.css) {
	lyr.css.display = "none";
  }
  }
}

function showLayer(id) {
  var lyr = getElemRefs(id);
  //if (lyr && lyr.css) lyr.css.visibility = "visible";
  if (lyr && lyr.css) lyr.css.display = "block";
  //alert ("Showing layer: "+ id + " " + lyr.css.display);
}

function hideLayer(id) {
  var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.visibility = "hidden";
  if (lyr && lyr.css) lyr.css.display = "none";
}

function getElemRefs(id) {
    var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? getLyrRef(id,document): null;
    if (el) el.css = (el.style)? el.style: el;
    return el;
}

function getLyrRef(lyr,doc) {
    if (document.layers) {
        var theLyr;
        for (var i=0; i<doc.layers.length; i++) {
        theLyr = doc.layers[i];
            if (theLyr.name == lyr) return theLyr;
            else if (theLyr.document.layers.length > 0)
            if ((theLyr = getLyrRef(lyr,theLyr.document)) != null)
                    return theLyr;
      }
        return null;
  }
}