var intTextSize=1; // default size
var intContrast=1; // default contrast
var intMaxTextSize=3;
var intMaxContrast=3;

window.onload = function(e) {
	var cookie = readCookie("TextSize");
	intTextSize = cookie ? parseInt(cookie) : intTextSize;
	var cookie = readCookie("Contrast");
	intContrast = cookie ? parseInt(cookie) : intContrast;
	setActiveStyleSheet("textsize" + intTextSize + ",contrast" + intContrast);
	}

window.onunload = function(e) {
	createCookie("TextSize", intTextSize, 365);
	createCookie("Contrast", intContrast, 365);
	}

function setTextSize(intModifier) {
	if ((intTextSize + intModifier > 0) && (intTextSize + intModifier <= intMaxTextSize)) {
		intTextSize+=intModifier;
		setActiveStyleSheet("textsize" + intTextSize + ",contrast" + intContrast);
		}
	}

function setContrast(intModifier) {
	if ((intContrast + intModifier > 0) && (intContrast + intModifier <= intMaxContrast)) {
		intContrast+=intModifier;
		setActiveStyleSheet("textsize" + intTextSize + ",contrast" + intContrast);
		}
	}

function setActiveStyleSheet(title) {
	var i, a, main, j;
	var arrTitles=title.split(",");
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
			a.disabled = true;
			for (j=0; j<arrTitles.length; j++) {if (a.getAttribute("title")==arrTitles[j]) {a.disabled=false}}
			}
		}
	}

function readCookie(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;
	}

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 expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
	}