var g_ReEx_email =	/^[^"@;'/"]+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/

function submitform() 
{
    var emailaddress = document.getElementById('email').value;
    if (g_ReEx_email.test(emailaddress)) 
    {
        document.weekend.submit();
    } 
    else 
    {
        var input = document.getElementById('email');
        input.value = 'Email adres is ongeldig'
        input.style.background = "red";
        return false;
    }
}

function clearTextBox()
{
    var input = document.getElementById('email');
    
    input.value = '';
    input.style.background = "white";
}