function setCookie(nom, valeur, expires) {
	document.cookie = nom + '=' + escape(valeur)
			+ ((expires == null) ? '' : ('; expires=' + expires.toGMTString()));
}

function argsCookie(offset) {
	var endstr = document.cookie.indexOf(';', offset);
	if (endstr == -1)
		endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}

function getCookie(nom) {
	var arg = nom + '=';
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen) {
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg)
			return argsCookie(j);
		i = document.cookie.indexOf(' ', i) + 1;
		if (i == 0)
			break;
	}
	return null;
}

function delCookie(nom) {
	var valeur = '';
	var date = new Date;
	date.setFullYear(date.getFullYear() - 1);
	setCookie(nom, valeur, date);
}