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

function readCookie(name) {
var nameEQ = escape(name) + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return unescape(c.substring(nameEQ.length,c.length));
}
return null;
}

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