function getCookieVal(offset) {

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

}

function readCookie(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 getCookieVal(j);
		i=document.cookie.indexOf(' ',i)+1;
		if (i==0) break;
	}
	
	return 'z';
	
}