function control(form2mail)
{
	
	if (form2mail.email.value=="")
    {
        alert("Zadejte e-mailovou adresu!");
        form2mail.email.focus();
        return false;
    }
	else if (window.RegExp)
    {
        re = new RegExp("^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$");
        if (!re.test(form2mail.email.value))
        {
            alert("Toto není správná e-mailová adresa!");
            form2mail.email.focus();
            return false;
        }
    }
    else 
        return true;
}