var pid = '';
 var origWidth, origHeight;
 var cur_lyr;	// holds id of currently visible layer

 if (document.layers) {
   origWidth = window.innerWidth; origHeight = window.innerHeight;
   window.onresize = function() { 
     if (window.innerWidth != origWidth || window.innerHeight != origHeight) history.go(0); 
   }
 }

 function updatePageLayer(id) {
   // Start 
   if (id == 'layTextStart') {
     pid = 'start';
   }
   // Väder 
   if (id == 'layTextNews') {
     pid = 'news';
   }
   // Vägbeskrivning 
   if (id == 'layTextMap') {
     pid = 'map';
   }
   // Aktuellt 
   if (id == 'layTextCurrent') {
     pid = 'current';
   }
   // Sponsorer 
   if (id == 'layTextSponsors') {
     pid = 'spons';
   }
   // Gästbok 
   if (id == 'layTextGuestbook') {
     pid = 'guestbook';
   }
 }

 function swapLayers(id) {
   updatePageLayer(id);
   if (cur_lyr) hideLayer(cur_lyr);
   showLayer(id);
   cur_lyr = id;
 }

 function firstLayer(id) {
   var lyr = getElemRefs(id);
   cur_lyr = lyr;
 }

 function showLayer(id) {
   var lyr = getElemRefs(id);
   if (lyr && lyr.css) lyr.css.visibility = "visible";
 }

 function hideLayer(id) {
   var lyr = getElemRefs(id);
   if (lyr && lyr.css) lyr.css.visibility = "hidden";
 }

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

 function setStatus(desc) {
   window.status = desc;
 }
 function showImage(img) {
   document.location = "?img=" + img + "&page=" + pid;
 }