function showLieferAdresse( el)
{
    if( el.checked == false )
    {
        document.getElementById("lieferdiv").style.display = "none";
    }
    else
    {
        document.getElementById("lieferdiv").style.display = "block";
    }
}

function EMail(s)
{
    var a = false;
    var res = false;
    if(typeof(RegExp) == 'function')
    {
        var b = new RegExp('abc');
        if(b.test('abc') == true) {
            a = true;
        }
    }

    if(a == true)
    {
        reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+'(\\@)([a-zA-Z0-9\\-\\.]+)'+'(\\.)([a-zA-Z]{2,4})$');
        res = (reg.test(s));
    }
    else
    {
        res = (s.search('@') >= 1 &&
        s.lastIndexOf('.') > s.search('@') &&
        s.lastIndexOf('.') >= s.length-5)
    }

    return(res);
}