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_link;
function doLinkClass(lnk) {
if (lnk && lnk.blur) lnk.blur();
if (!lnk || cur_link == lnk) return;
if (cur_link) cur_link.className = "done";
lnk.className = "on";
cur_link = lnk;
}

var cur_lyr;
function swapLayers(lnk,id) {
doLinkClass(lnk);
if (cur_lyr) hideLayer(cur_lyr);
showLayer(id);
cur_lyr = id;
}

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

function hideLayer(id) {
var lyr = getElemRefs(id);
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 init(id,lyr) {
var lnk = getElemRefs(id);
swapLayers(lnk,lyr);
}