function popup(url, fenetre, largeur, hauteur) {
    var coordY  = ( screen.height - hauteur ) / 2;
    var coordX  = ( screen.width - largeur ) / 2;
    window.open( url, fenetre, "top=" + coordY + ", left=" + coordX + ", width=" + largeur + ", height=" + hauteur + ", status=no, resizable=yes, location=no, directories=no, scrollbars=yes");
}

function popupUnique ( url, fenetre ) {
	popup(url, fenetre, 500, 500);
}

function isNumeric(valeur) {
	if(valeur != ""){
		if(isNaN(valeur)){
			return(false);
		}
	}
	return true;
}

 function isEmail(a)
 {
	return ((/^[-_A-Za-z0-9]+(\.[-_A-Za-z0-9]+)*@[-A-Za-z0-9]+(\.[-A-Za-z0-9]+)+$/).test(a));
 }