var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();

if (BrowserDetect.browser=='Explorer' && BrowserDetect.version < 7) {
	//alert("IE6")
	document.write ("<link rel='stylesheet' href='/css/png_bcg_IE6.css' />") 
}else{
	//alert("other")
	document.write ("<link rel='stylesheet' href='/css/png_bcg_other.css' />") 
}

function find(e,field) {
var keycode = event.keyCode ? event.keyCode : event.which;
if (keycode ==8) return true;//ff workaround
if(keycode == 13){
e.cancel = true;
e.returnValue = false;
if (field.value.length==5) window.location="/Search/" + field.value + ".html";  
return false;
}
else if (keycode < 48 || keycode > 57) {
    return false;
}
}

function go(){
var zipf = document.getElementById('ziptext');
if (zipf.value.length==5) window.location="/Search/" + zipf.value + ".html"
}

function toggleDisplay(layer,checked){
if (checked) { 
document.getElementById(layer).style.display="";
} else {
document.getElementById(layer).style.display="none";
}
}
// code for swaping layers in tabbed navigation
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); }
}

// link style change
var cur_link;
function doLinkClass(lnk) {
  if (lnk && lnk.blur) lnk.blur();	// remove marquee
  if (!lnk || cur_link == lnk) return;
  if (cur_link) cur_link.className = "";
  lnk.className = "active";
  cur_link = lnk;
}
var cur_featLink;
function doFeatLinkClass(lnk) {
  if (lnk && lnk.blur) lnk.blur();	// remove marquee
  if (!lnk || cur_featLink == lnk) return;
  if (cur_featLink) cur_featLink.className = "features";
  lnk.className = "features_open";
  cur_featLink = lnk;
}

var cur_lyr;	// holds id of currently visible layer
function swapTabLayers(lnk,id) { // for tabs
  doLinkClass(lnk);
  if (cur_lyr) hideLayer(cur_lyr);
  showLayer(id);
  (cur_lyr) = id;
}
var cur_featLyr;	// holds id of currently visible feature layer
function swapFeatLayers(lnk,id) { // for features
  doFeatLinkClass(lnk);
  if (cur_featLyr) hideLayer(cur_featLyr);
  showLayer(id);
  cur_featLyr = 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;
}

// get reference to nested layer for ns4
// from old dhtmllib.js by Mike Hall of www.brainjar.com
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);
  swapTabLayers(lnk,lyr);
}
// end of swap layers code