function check_email(form,e) {
	if (e) var email = form['FE[fe_users][mail]'].value;
	else var email = form['regmail'].value;	
	if (email=="") {
		alert("Vložte email.");return false;
	}
	else if (window.RegExp)
    {
        re = new RegExp("^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$");
        if (!re.test(email)) {
            alert("Vložte e-mail ve správném formátu.");return false;
        }
    }
}