function writeCookie(name, value, days){
    if (days) {
        (time = new Date()).setTime(new Date().getTime() + days*24*60*60*1000);
        var exp = "; expires="+time.toGMTString();
    } else {
        var exp="";
    }
    document.cookie=name+"="+value+exp+"; path=/";
}

function readCookie(name){
    var cookies = document.cookie.split(";");
    for (var i=0; i<cookies.length; i++){
        var cookie=cookies[i].replace(/^\s+/, "");
        if (cookie.indexOf(name+"=") == 0) return cookie.substring(name.length+1);
    }
    return null;
}

function eraseCookie(name){
    writeCookie(name, "", -1);
}

function addFromMappaInfo(){
    var counter = readCookie("fromMappa");
    if (counter){
        counter = parseInt(counter);
    } else {
        counter = 0;
    }

    writeCookie("fromMappa", 1, 1);
}

function isFromMappa() {
	var fromMappa = readCookie("fromMappa");
	if (fromMappa) {
		return true;
	}
	return false;
}

function eraseFromMappaInfo() {
	eraseCookie("fromMappa");
}