function show_name_field (_obj)
 {
	if (document.getElementById('name_other').selected) document.getElementById('name_other_DIV').style.display = 'block';
		else document.getElementById('name_other_DIV').style.display = 'none';
 }
 
 function show_format_field()
 {
	if (document.getElementById('format_other').selected) document.getElementById('format_other_DIV').style.display = 'block';
		else document.getElementById('format_other_DIV').style.display = 'none';
 }
 
 function email_is_valid() { //alert(document.getElementById('email').value); return false;
	_email = document.getElementById('email').value;

 
    email_re1 = /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)|(\.$)/ ;
    email_re2 = /^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/ ;
    if (_email == "" || email_re1.exec(_email) || !email_re2.exec(_email))
        return false;
    return true;
}