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

function getCookie(name)
	{
	var arg=name+"=";
	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 getCookieVal (j);
		i=document.cookie.indexOf(" ",i)+1;
		if (i==0)
			break;
		}
	return null;
	} 
function writeCookie(nom, valeur, expires)
	{
	document.cookie=nom+"="+escape(valeur)+
	((expires==null) ? "" : ("; expires="+expires.toGMTString()+"; path=/"));
	}