function validate_form(){
    var rsp = false;  
    $.ajax({
        url: 'cgi-bin/lnl-board-3.pl',
        type: 'POST',
        async: false,
        cache: false,
        data: $('#contact_form').serialize(),
        success: function(data) {
            if(data.match(/OK/) != null){
                rsp = true
            }else{
                alert(data);
            }
        }
    });
    return rsp;
}