function trim(str) {
    return str.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
}

function isNumeric(value) {
    value = String(value);
    var reNumeric = /^[0-9]+$/;
    
    if (value.match(reNumeric)) return true;
    else return false;
}

function set_cookie(name, value, exp_y, exp_m, exp_d, path, domain, secure) {
    var cookie_string = name + "=" + escape(value);

    if (exp_y) {
        var expires = new Date(exp_y, exp_m, exp_d);
        cookie_string += "; expires=" + expires.toGMTString();
    }

    if (path) cookie_string += "; path=" + escape(path);

    if (domain) cookie_string += "; domain=" + escape(domain);

    if (secure) cookie_string += "; secure";

    document.cookie = cookie_string;
}

function delete_cookie(cookie_name) {
    var cookie_date = new Date();  // current date & time
    cookie_date.setTime(cookie_date.getTime() - 1);
    document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}

function get_cookie(cookie_name) {
    var results = document.cookie.match('(^|;) ?' + cookie_name + '=([^;]*)(;|$)');

    if (results)
        return (unescape(results[2]));
    else
        return null;
}