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

function readCookie(name) {
    var nameEQ = 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 c.substring(nameEQ.length,c.length);
    }
    return null;
}

function removeCookie(name) {
    document.cookie = name+"=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
}

function no_error(retrieved_data) {
    if (
        retrieved_data.substr(0, 11).toLowerCase() != 'fatal error' &&
        retrieved_data.substr(0, 5).toLowerCase() != 'error' &&
        retrieved_data.substr(0, 4).toLowerCase() != 'fail' &&
        retrieved_data.substr(0, 26).toLowerCase() != 'notice: undefined variable'
            ) return true;
    else return false
}

function get_radio_value(radio_object) {
    var radio_length = radio_object.length;
    if (radio_length == undefined) if (radio_object.checked) return radio_object.value; else return '';
    for (var i = 0; i < radio_length; i++) if (radio_object[i].checked) return radio_object[i].value;
    return '';
}