function supprimerCaractere(e) {
    var keynum;
    var keychar;
    var numcheck;
    if (window.event) keynum = window.event.keyCode;
    else if (e.which) keynum = e.which;
    keychar = String.fromCharCode(keynum);
    //Caractères non autorisés
    numcheck = /[_\-1234567890&`~@"'#)<>\|\\°\]=+ }(^¨$¤£%µ*!§:/²;\.?,{\[]/;
    if (window.event && !( !numcheck.test(keychar) || keychar == " " ) ){
        window.event.cancelBubble = true;
    }
    return !numcheck.test(keychar) || keychar == " ";
}