function getStandardFontsize() {
	return "11px";
}

function raiseFontsize(){
	oldsize = parseInt(getActiveFontsize().replace(/px/, ''));
	oldsize++;
	setFontsize(oldsize + 'px');
};

function lowerFontsize() {
	oldsize = parseInt(getActiveFontsize().replace(/px/, ''));
	oldsize--;
	setFontsize(oldsize + 'px');
}

function setDefaultFontsize() {
	setFontsize(getStandardFontsize());
}

function getActiveFontsize() {
	return document.body.style.fontSize;
}

function setFontsize(size) {
	document.body.style.fontSize = size;
}

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=/";
}

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;
}

window.onload = function(e) {
	var cookie = readCookie("fontsize");
	var fontsize = cookie ? cookie : getStandardFontsize();
	setFontsize(fontsize);
}

window.onunload = function(e) {
	var fontsize = getActiveFontsize();
	createCookie("fontsize", fontsize, 365);
}