function open_popup(id) {
	//document.getElementById("gris").style.visibility = "visible";
    //change_header('popup_inscription.php','popup');
	var fenlarg = (document.body.clientWidth);
	var fenhaut = (document.body.clientHeight);
	var poppos = fenlarg/2 - 344; 
	document.getElementById(id).style.left = poppos+'px';
	//document.getElementById(id).style.top = '200px';
	document.getElementById(id).style.visibility = "visible";
	document.getElementById("popup_back").style.width = fenlarg+'px';
	document.getElementById("popup_back").style.height = fenhaut+'px';
	document.getElementById("popup_back").style.visibility = "visible"; 
}

function close_popup(id) {
	//document.getElementById("gris").style.visibility = "hidden";
	document.getElementById("popup_back").style.visibility = "hidden";
	document.getElementById(id).style.visibility = "hidden";
}

function writediv(texte)
     {
     document.getElementById('pseudobox').innerHTML = texte;
     }