var min=8;
var max=18;
function increaseFontSize() {
	var p = document.getElementsByTagName('p');
	for(i=0;i<p.length;i++) {
		 if(p[i].style.fontSize) {
			var s = parseInt(p[i].style.fontSize.replace("px",""));
		} else {
			var s = 12;
			}
		if(s!=max) {
			s += 1;
			}
		p[i].style.fontSize = s+"px"
		}
	}
function decreaseFontSize() {
	var p = document.getElementsByTagName('p');
	for(i=0;i<p.length;i++) {
		if(p[i].style.fontSize) {
			var s = parseInt(p[i].style.fontSize.replace("px",""));
		} else {
			var s = 12;
			}
		if(s!=min) {
			 s -= 1;
			}
		p[i].style.fontSize = s+"px"
		}   
	}
	
var newwindow;
function ouvreFenetre(url){
	newwindow=window.open(url, 'window_name','height=400,width=820, left=100,  top=50,resizable=yes,scrollbars=yes,toolbar=yes,status=yes, location=no');
	if (window.focus) {newwindow.focus()}
	}
	
function redirect_Choice(){
	if(document.getElementById("choix_site").value!= "Choisissez un site"){
		document.location.replace(document.getElementById("choix_site").value);}}
		
function afficher_block(block){
		if(document.getElementById(block).style.display=="none"){
			document.getElementById(block).style.display='block';	
			}
		else{
			document.getElementById(block).style.display='none';	
			}
		}