function confirm_action(url)
{
    check = confirm("Sicher?");
    if (check == true)
    {
        window.location = url;
    }
}

function check_empty(text)
{
    return (text.length > 0);
}

function check_url(address)
{
    if ((address == "") || (address.indexOf('http://') == -1) || (address.indexOf('.') == -1)) return false;
    else return true;
}

function check_number(text)
{
    if (text.match(/[A-Za-z]/)) return false;
    else if (text.length == 0) return false;
    else return true;
}

function check_mail(wert)
{
    reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)(\\@)([a-zA-Z0-9\\-\\.]+)(\\.)([a-zA-Z]{2,4})$');
    res = (reg.test(wert));
    return(res);
}

function check_plz(wert)
{
    reg = new RegExp('^[0-9]{4}$');
    res = (reg.test(wert));
    return(res);
}

function check_telefon(wert)
{
    reg = new RegExp('^[0-9 ]+$');
    res = (reg.test(wert));
    return(res);
}

function check_datum(wert)
{
    reg = new RegExp('^[0-9]{2}\\.[0-9]{2}\\.[0-9]{4}$');
    res = (reg.test(wert));
    return(res);
}