// JavaScript Document
// 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){
	   //alert(lyr.css.display);
	   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 showSectionLayers(section) {
    for (i=1;i<30;i++) {
        try {
	  lyr = getElemRefs(section+i);
  	  if (lyr && lyr.css) {
	      lyr.css.display = "block";
	  }
        } catch (e) {
        }
    }
}

function hideSectionLayers() {
    args=hideSectionLayers.arguments;
    for (i=0;i<args.length;i++){
	    for (j=1;j<30;j++) {
		try {
		  lyr = getElemRefs(args[i]+j);
  		  if (lyr && lyr.css) {
		      lyr.css.display = "none";	
		  }
		} catch (e) {
		}
	    }
    }
}



// case studies

function hideAllCaseStudySectionLayers() {
	hideSectionLayers('HMRC', 'RoyalMail', 'RBS', 'Salesout', 'DairyCrest', 'Gatwick','Central','Midland','Silverlink','Chiltern','Wagn','Stansted');
}

function showRoyalMail () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('RoyalMail');
}

function showHMRC () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('HMRC');
}

function showRBS () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('RBS');
}

function showSalesout () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('Salesout');
}

function showDairyCrest () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('DairyCrest');
}

function showGatwick () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('Gatwick');
}

function showCentral () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('Central');
}

function showMidland () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('Midland');
}

function showSilverlink () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('Silverlink');
}

function showChiltern () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('Chiltern');
}

function showWagn () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('Wagn');
}

function showStansted () {
	hideAllCaseStudySectionLayers();
	showSectionLayers('Stansted');
}

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 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];}
}