//To work with Accessibility buttons.
///////////////////////

var cookieEnabled=(navigator.cookieEnabled)? true : false

function noCookies () {
alert ("This functionality requires you to accept Cookies in your browser!")
}



//create cookie
function createCookie(name,value,days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}


//read cookie
function getCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

//writes first stylesheets.

if (getCookie("size")==null) {
createCookie ("size", 0, 0);
createCookie ("font", 0, 0);
createCookie ("contrast", 0, 0);
createCookie("caps", 0, 0);
createCookie("leading", 0, 0);
}






//writes style sheet into page.

function writeStyleSheet(stylesheet) {
var path = "css/" + stylesheet + ".css";
var link = '<link rel="stylesheet" media="all" type="text/css" href="'+path+'" />';
document.write(link);
}

//write all stylesheets, called when page reloads

function writeStylesheets(){

//strip cookie to relevant parts

if (cookieEnabled) {
size = getCookie("size");
font = getCookie("font");
contrast = getCookie("contrast");
caps = getCookie("caps");
leading = getCookie("leading")
}

else {
size = 0;
font = 0;
contrast = 0;
caps = 0;
leading = 0;
}

//write size sheet
writeStyleSheet("size"+size);

//write leading sheet
writeStyleSheet("leading"+leading);

//write contrast
writeStyleSheet("contrast"+contrast);

//write font
writeStyleSheet("font"+font);

//write caps
writeStyleSheet("caps"+caps);
}

//individual function buttons

//sizeUp
function sizeUp(){
if (cookieEnabled){
var currentsize = getCookie("size");
if (currentsize<2) currentsize++;
size = currentsize;
createCookie("size", size, 0);
self.location = self.location;
}
else noCookies();
}


//sizeDown
function sizeDown(){
if (cookieEnabled){
var currentsize = getCookie("size");
if (currentsize>0) currentsize--;
size = currentsize;
createCookie("size", size, 0);
self.location = self.location;
}
else noCookies();
}


//leadingUp
function leadingUp(){
if (cookieEnabled){
var currentleading = getCookie("leading");
if (currentleading<2) currentleading++;
leading = currentleading;
createCookie("leading", leading, 0);
self.location = self.location;
}
else noCookies();
}

//leadingDown
function leadingDown(){
if (cookieEnabled){
var currentleading = getCookie("leading");
if (currentleading>0) currentleading--;
leading = currentleading;
createCookie("leading", leading, 0);
self.location = self.location;
}
else noCookies();
}


//font
function toggleFont(){
if (cookieEnabled){
var currentFont = getCookie("font");
if (currentFont == 0) font = 1
else font = 0
createCookie("font", font, 0);
self.location = self.location;
}
else noCookies();
}

//caps
function toggleCaps(){
if (cookieEnabled){
var currentCaps = getCookie("caps");
if (currentCaps == 0) caps = 1
else caps = 0
createCookie("caps", caps, 0);
self.location = self.location;
}
else noCookies();
}

//contrast
function toggleContrast() {
if (cookieEnabled){
var currentContrast = getCookie("contrast");
if (currentContrast == 0) contrast = 1;
else contrast = 0;
createCookie("contrast", contrast, 0);
self.location = self.location;
}
else noCookies();
}

//default
function reset(){
if (cookieEnabled){
var size=0;
var leading=0;
var caps=0;
var contrast=0;
var font=0;
createCookie("size", size, 0);
createCookie("leading", leading, 0);
createCookie("caps", caps, 0);
createCookie("contrast", contrast, 0);
createCookie("font", font, 0);
self.location = self.location;
}
else noCookies();
}