// 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;
  }
}

function hideIt(id) {
	MM_swapImage('Image3','','/nap/build_8.13.1/images/tab_moredetails2.gif',1);
}

function swapLayers(id) {
  //if (cur_lyr) hideLayer(cur_lyr);
  //showLayer(id);
  //alert (id);
 if      (id == 'layer1') {
     // MM_swapImage('Image1','','/nap/build_8.13.1/images/tab_keyfeatures1.gif',1);
      hideLayer('layer2');
     // MM_swapImage('Image2','','/nap/build_8.13.1/images/tab_specification0.gif',1);
     hideLayer('layer3');
	 showLayer('layer1');
      //MM_swapImage('Image3','','/nap/build_8.13.1/images/tab_moredetails0.gif',1);
  }
  else if (id == 'layer2') {
      //MM_swapImage('Image2','','/nap/build_8.13.1/images/tab_specification1.gif',1);
      //hideLayer('layer1');
     // MM_swapImage('Image1','','/nap/build_8.13.1/images/tab_keyfeatures0.gif',1);
     // hideLayer('layer3');
     // MM_swapImage('Image3','','/nap/build_8.13.1/images/tab_moredetails0.gif',1);
  }
  else if (id == 'layer3') {
     // MM_swapImage('Image3','','/nap/build_8.13.1/images/tab_moredetails1.gif',1);
     // hideLayer('layer1');
     // MM_swapImage('Image1','','/nap/build_8.13.1/images/tab_keyfeatures0.gif',1);
     // hideLayer('layer2');
    //  MM_swapImage('Image2','','/nap/build_8.13.1/images/tab_specification0.gif',1);
  }
  showLayer(id);
  //cur_lyr = id;
}

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_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) { //v4.01
  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 && d.getElementById) x=d.getElementById(n); return x;
}

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];}
}