function validate_request()
{
    var message = '';
    var name      = document.getElementById('f-fullname');
    var telephone = document.getElementById('f-phone');
    var email     = document.getElementById('f-email');
    if ( name.value.length == 0 ) message += '- Please enter your full name\n';
    if ( telephone.value.length == 0 ) message += '- Please enter your telephone number\n';
    if ( email.value.length == 0 ) message += '- Please specify your email address\n';
    if ( message.length > 0 )
        alert(message);
        
    return message.length == 0;
}