Ciao scusa ma riesco a rispondere solo adesso,
questa è la pagina completa di java riesci a darmi una mano, sono 3 gironi che impazzisco.
grazie ciao

Codice PHP:
<?php

// impostazioni variabili
$og_html=array("nick","oggetto");
$fnome="./messaggi.txt";

// funzione controllo
function controllo() {
 global $og_html, $_REQUEST;

 foreach($og_html as $val) {
    if(empty($_REQUEST[$val])) return false;
 };
 return true;
}

// controllo dati ricevuti
if(controllo()) {

    // modifica dati
    $nick=substr($_REQUEST["nick"],0,10);
    $oggetto=substr($_REQUEST["oggetto"],0,60);
    $nick=htmlspecialchars($nick);
    $oggetto=htmlspecialchars($oggetto);

    // apertura file
    $file=file($fnome);

    for($x=1; $x<count($file); $x++) $file_tmp[]=$file[$x];

    $file_tmp[]="\n$nick: $oggetto";

    $file=fopen($fnome,"w+");
    fwrite($file,implode("",$file_tmp));
    fclose($file);

};

// lettura file
$file=file($fnome);

// formattazione
unset($tmp_file);
for($x=0; $x<count($file); $x++) {
    $file[$x]=addslashes(trim($file[$x],"\n"));
};

for($x=count($file)-1; $x>=0; $x--) $tmp_file[]=$file[$x];

// variabile da passare allo script
$cont_file=implode(" - ",$tmp_file);
?>

<html>
<head>
    <title>Messaggi scorrevoli</title>

<style type="text/css">
<!--
a {
    color:blue;
    text-decoration:underline
}
a:hover {
    color:red;
    text-decoration:underline overline
}
body {
    font:normal 1pc arial;
    color:black
}
table#tab_cont td {
    border:#000000 1px solid
}
input {
    border:#000000 1px solid
}
-->
</style>

</head>
<body>

<table width="200" style="border:#000000 1px solid">
<tr><td>

<div id="frm">
<form method="post" action="<?php print($_SERVER["PHP_SELF"]); ?>" onsubmit="return valida(this);" style="padding:0px; margin:0px">
<table width="200">
<tr><td>Nick:</td><td><input type="text" name="nick"></td></tr>
<tr><td>Oggetto:</td><td><input type="text" name="oggetto"></td></tr>
<tr><td colspan="2" align="center"><input type="reset" value="Resetta"><input type="submit" value="Invia"></td></tr>
</table>
</form>
</div>

</td></tr>
<tr><td>

<script type="text/javascript">
<!--
var tempo=100;
var scroll=5;
var timer=null;
var timer_indietro=null;
var timer_avanti=null;
var scroll_vel=scroll+10;

// funzione valida
function valida(qst) {
var reg=new RegExp("^[ ]*$");
var chi=null;
 try {
    if(reg.test(qst.nick.value)) {
        chi="nick";
        throw "Non hai inserito il nick...";
    };
    if(reg.test(qst.oggetto.value)) {
        chi="oggetto";
        throw "Non hai inserito l'oggetto...";
    };
 }
 catch(mes) {
    window.alert(mes);
    qst.elements[chi].focus();
    return false;
 };
return true;
};

// funzione init
function init() {
    document.getElementById("mes_scor").style.left=document.getElementById("cont_mes").offsetWidth+"px";
    document.getElementById("mes_scor").style.top="0px";
    scrolla();
};

// funzione scrolla
function scrolla() {
    if(parseInt(document.getElementById("mes_scor").style.left)>-(document.getElementById("mes_scor").offsetWidth+scroll)) {
        document.getElementById("mes_scor").style.left=(parseInt(document.getElementById("mes_scor").style.left)-scroll)+"px";
    }
    else {
        document.getElementById("mes_scor").style.left=document.getElementById("cont_mes").offsetWidth;
    };
timer=window.setTimeout("scrolla();",tempo);
};

// funzione stop
function stop() {
    clearTimeout(timer);
};

// funzione play
function play() {
    if(window.timer) clearTimeout(timer);
    window.setTimeout("scrolla();",tempo);
};

// funzione indietro
function indietro() {
    if(parseInt(document.getElementById("mes_scor").style.left)<document.getElementById("cont_mes").offsetWidth) {
        document.getElementById("mes_scor").style.left=parseInt(document.getElementById("mes_scor").style.left)+(scroll_vel);
    }
    else {
        clearTimeout(timer_indietro);
    };
    timer_indietro=window.setTimeout("indietro();",tempo);    
};

// funzione avanti
function avanti() {
    if(parseInt(document.getElementById("mes_scor").style.left)>-(document.getElementById("mes_scor").offsetWidth+(scroll_vel))) {
        document.getElementById("mes_scor").style.left=parseInt(document.getElementById("mes_scor").style.left)-(scroll_vel);
    }
    else {
        clearTimeout(timer_avanti);
    };
    timer_avanti=window.setTimeout("avanti();",tempo);
};

document.write("<div id=\"cont\">");
document.write("<table width=\"200\" border=\"0\" id=\"tab_cont\">");
document.write("<tr><td align=\"center\"><a href=\"#\" onmousedown=\"if(window.timer) clearTimeout(timer); indietro();\" onmouseup=\"if(window.timer_indietro) clearTimeout(timer_indietro); play();\" tilte=\"Indietro\">&lt;&lt;</a></td><td align=\"center\"><a href=\"#\" onclick=\"stop();\" title=\"Stop\">||</a>|<a href=\"#\" onclick=\"play();\" title=\"Play\">&gt;&gt;</a><td align=\"center\"><a href=\"#\" onmousedown=\"if(window.timer) clearTimeout(timer); avanti();\" onmouseup=\"if(window.timer_avanti) clearTimeout(window.timer_avanti); play();\" title=\"Avanti\">&gt;&gt;</a></td></tr>");
document.write("<tr><td colspan=\"3\"><span id=\"cont_mes\" style=\"width:200px; position:relative; overflow:hidden\"><span id=\"mes_scor\" style=\"position:absolute; white-space:nowrap\"><?php print($cont_file); ?></span></span></td></tr>");
document.write("</table>");
document.write("</div>");

// funzione all'avvio
window.onload=init;
//-->
</script>

</td></tr>
</table>

</body>
</html>