/*
script permettant de modifier la feuille de style
http://www.sauvonslarecherche.fr/
*/

function plus(){
	var size= parseFloat(getActualFontSize());
	if(size < 1){
		size= size + 0.1;
		document.body.style.fontSize = size + "em";
		} 
		else alert(size + " Et si vous changiez plut\u00f4t de lunettes ?");
 	}

function moins(){
	var size= parseFloat(getActualFontSize());
	if(size > 0.5){
		size= size - 0.1;
		document.body.style.fontSize = size + "em";
	 	}
		else alert(size);
 	}

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

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

function getDefautSize(){
	return "0.625em";
	}
	
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 size = cookie ? cookie : getDefautSize();
	setSize(size);
	}

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