//browser and platform check to serve stylesheets
var an=navigator.appName;     // tells if Netscape or Explorer
var av=navigator.appVersion;  // tells if Mac or PC
var cssFile="";               // initial CSS file
var currentStyle="no";        // initial style

if (an == "Netscape") {
	if (navigator.appVersion.indexOf("Macintosh") == -1) {
		cssFile='winnn.css';
		currentStyle='Windows Netscape';
	}
	else {
		cssFile='macnn.css';
		currentStyle='Macintosh Netscape';
	}
}

if (an == "Microsoft Internet Explorer") {
	if (av.indexOf("Macintosh") == -1) {
		cssFile='winie.css';
		currentStyle='Windows Explorer';
	}
	else {
		cssFile='macie.css';
		currentStyle='Macintosh Explorer';
	}
}

function init() {
	document.write("<link rel='styleSheet' href='/includes/"+cssFile+"' type='text/css'>");
}

function writeStyle() {
	return currentStyle;
}

init();

//switch images
function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
    document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

//preload images
var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    about_on = newImage("images/b-about_on.gif");
    services_on = newImage("images/b-services_on.gif");
    government_on = newImage("images/b-government_on.gif");
    visit_on = newImage("images/b-visit_on.gif");
    business_on = newImage("images/b-business_on.gif");
    city_on = newImage("images/b-city_on.gif");
    council_on = newImage("images/b-council_on.gif");
    departments_on = newImage("images/b-departments_on.gif");
    advisory_on = newImage("images/b-advisory_on.gif");
    planning_on = newImage("images/b-planning_on.gif");
  preloadFlag = true;
  }
}