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

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

function lire_cookie(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 arguments_cookie(j);
		i=document.cookie.indexOf(" ",i)+1;
		if (i==0) break;
	}
	return null; 
}