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;	
function loadLyr(lyr) {
	if (cur_lyr) {
		var curcss = get_lyr_css(cur_lyr);
		if (curcss) curcss.visibility="hidden";
	}
  cur_lyr = lyr;
	var curcss = get_lyr_css(cur_lyr);
	if (curcss) {
		curcss.visibility = "visible";
		curcss.zIndex = 1000;	// some browsers need z-index set
	}
}

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

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;
  }
}
if (document.all) type="IE"; 



if (document.layers) type="NN"; 



if (!document.all && document.getElementById) type="MO"; 


function ShowLayer(id, action){
  if (type=="IE") eval("document.all." + id + ".style.visibility='" + action + "'");
  if (type=="NN") eval("document." + id + ".visibility='" + action + "'");
  if (type=="MO" || type=="OP") 
    eval("document.getElementById('" + id + "').style.visibility='" + action + "'");
}