function postGuestbook(){
    var posted_by = document.gbp.pb.value;
    var content = encode(document.gbp.content.value);
    if(posted_by == "" || content == ""){
        return;
    }
    
    new Ajax.Request("script/gbpost.php?msg="+content+"&co=NULL&pb="+posted_by, {
        method: "post",
        onSuccess: function(){
            window.location.href = "guestbook.php";
        },
        onFailure: function(){
            window.location.href = "guestbook.php";
        }
    });
};

function showGbPost(){ 
    $("gbpostboard").update( "<form name=gbp><label>Your Name</label><br><input name=pb type=\"text\"><br><label>Your Message</label><br><textarea name=content rows=7 cols=60></textarea><br><input id=\"gbooksubmit\" onclick=\"javascript:postGuestbook()\" value=\"Post\" type=\"button\"></form>" );
};