// JavaScript Document

var currentFontSize = 12;

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;
	};
	
	function changeFontSize(change) {
		currentFontSize = parseInt(currentFontSize) + parseInt(change)*2;
		
		if (currentFontSize > 16)
			currentFontSize = 16;
		else if (currentFontSize < 10)
			currentFontSize = 10;
		
		setFontSize(currentFontSize);
		
		saveSettings();
		
		//document.body.style.fontSize = document.body.style.fontSize + change;
	}
	
	function setFontSize(value) {
		document.getElementsByTagName('body')[0].style.fontSize = value + "px";
		currentFontSize = value;
		saveSettings();
	}
	
	
	window.onload = loadSettings;
	
	function loadSettings() {
		//alert('clang');
		cookie = readCookie("fontSize");
		currentFontSize = cookie ? cookie : 12;
		setFontSize(currentFontSize);
	}
	
	window.onunload = saveSettings;
	
	function saveSettings() {
		createCookie("fontSize", currentFontSize, 365);
	}