ciao io ho una chat che al momento del login mi chiede di inserire sia il nickname che la password, io invece volgio che nel login mi chieda solo la password e che il nikcname me lo metta poi una volta entrato in chat automaticamente senza che lo devo mettere io sul login:

vi posto i codici di chat.php e login.php e messaggi.php

chat.php:
Codice PHP:
<html>
<head>
<title>Happy Chat</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script language = "JavaScript">
function textCounter(field, countfield, maxlimit) {
   if(field.value.length > maxlimit){
      field.value = field.value.substring(0, maxlimit);
   }
   else{ 
      countfield.value = maxlimit - field.value.length;
   }
}
</script>
<script language="javascript">
  function aggiungi(y)
  {
  espressione=document.form_ins.messaggio.value;
  new_espressione=espressione + y;
  document.form_ins.messaggio.value=new_espressione;
  }
  </script>
<style>
.stile  {
        background:#FFFFFF;
        font-family:verdana;
        font-size:8pt; 
        SCROLLBAR-BASE-COLOR: #0099CC;
        SCROLLBAR-ARROW-COLOR: #FFFFFF;
        }
</style>
</head>

<body bgcolor="#FBBEAA">
<?
include("config.php");

$nick=$_GET['nick'];
$nick=strtolower($nick);
$nick=stripslashes($nick);
$password=$_GET['password'];
$password=strtolower($password);
$password_cr=crypt($password,$nick);
$password_cr=str_replace("|","*",$password_cr);



if (!(
file_exists($file_reg)))
{
fopen($file_reg,"w");}

$utente=$nick."|".$password;
$utente_ok=0;
$ut_regist=file($file_reg);
$dim_reg=count($ut_regist);
for (
$i=0;$i<$dim_reg;$i++)
{
$dati_ut=explode("|",$ut_regist[$i]);
$nick_ut=$dati_ut[0];
$pass_ut=$dati_ut[1];
if ((
$nick==$nick_ut) & ($password_cr==$pass_ut)) $utente_ok=1;
}

if (
$utente_ok==1)
{
if (!(
file_exists($file_online)))
{
fopen($file_online,"w");}

$dim_file=filesize($file_online);
$dim_max=14000// Dimensione in bytes massima per ricreare il file online

if ($dim_file>$dim_max)
fopen($file_online,"w");

$ar_orario=getdate();
$ora=$ar_orario['hours'];
$minuti=$ar_orario['minutes'];
$secondi=$ar_orario['seconds'];
if (
strlen($minuti)==1$minuti="0".$minuti;
if (
strlen($secondi)==1$secondi="0".$secondi;

$data=date("d/m/Y");
$orario=$ora.":".$minuti.":".$secondi;
$utente=$nick."|".$data."|".$orario."\n";

$ins_online=fopen($file_online,"a+");
fputs($ins_online,$utente);
fclose($ins_online);
}
else
{
echo 
"<center>[b]E' STATO INSERITO
UN NICK O UNA PASSWORD
NON CORRETTI,
OPPURE NON SEI
ANCORA REGISTRATO.[/b]

"
;
echo 
"<a href=\"javascript:history.back();\">TORNA AL LOGIN</a></center>";
exit;
}
?>
<table width="208" align="center" bordercolor="#000000" bgcolor="#E7E9FA" style="border:1px solid;">
        <tr> 
          <td width="208" height="21" colspan="6" bgcolor="#BBC2F2"><div align="center">
<div align="center"><iframe src="http://www.globalmeteo.altervista.org/chat/messaggi.php" width="200" height="100" scrolling="yes"></iframe> 
    </td></tr></table>


    <div align="center"> 
      
<table width="208" align="center" bordercolor="#000000" bgcolor="#E7E9FA" style="border:1px solid;">
        <tr> 
          <td width="208" height="21" bgcolor="#BBC2F2"><div align="center"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">[b]PERSONE 
              ON-LINE [/b]</font></div></td>
        </tr>
        <tr> 
          <td height="21"><iframe width="200" height="50" src="online.php" scrolling="no"></iframe></td>
        </tr>
      </table>
      



<form method="GET" action="insert.php" name="form_ins" > 

<table width="208" align="center" bordercolor="#000000" bgcolor="#E7E9FA" style="border:1px solid;">
        <tr> 
          <td width="208" height="21" colspan="6" bgcolor="#BBC2F2"><div align="center"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">[b]SIMBOLI METEO - SMILES[/b]</font></div></td>
        </tr>
    <tr><td colspan="4"><div align="center">
<? 

if ( empty($_GET['faccina']) ) $faccina "" 
else 
$faccina $_GET['faccina'] ; 

echo 

<select name=\"faccina\" size=\"1\"> 

<option value=\"[em1]\" "

if ( 
$faccina == "[em1]" ) echo " selected" 
echo 
">sereno</option> 

<option value=\"[em2]\" "

if ( 
$faccina == "[em2]" ) echo " selected" 
echo 
">poco-nuvoloso</option> 

<option value=\"[em3]\" "

if ( 
$faccina == "[em3]" ) echo " selected" 
echo 
">nuvoloso</option> 

<option value=\"[em4]\" "

if ( 
$faccina == "[em4]" ) echo " selected" 
echo 
">luna</option> 

<<option value=\"[em5]\" "

if ( 
$faccina == "[em5]" ) echo " selected" 
echo 
">luna-nuvoloso</option> 

<option value=\"[em6]\" "

if ( 
$faccina == "[em6]" ) echo " selected" 
echo 
">pioggia</option> 

<option value=\"[em7]\" "

if ( 
$faccina == "[em7]" ) echo " selected" 
echo 
">pioggia-neve</option> 

<option value=\"[em8]\" "

if ( 
$faccina == "[em8]" ) echo " selected" 
echo 
">temporale</option> 

<option value=\"[em9]\" "

if ( 
$faccina == "[em9]" ) echo " selected" 
echo 
">neve</option> 

<option value=\"[em10]\" "

if ( 
$faccina == "[em10]" ) echo " selected" 
echo 
">nebbia</option> 

</select> 
"


?> </td>            

          <td height="21"><div align="center">[img]emoticons/em11.gif[/img]</div></td>
          <td height="21"><div align="center">[img]emoticons/em12.gif[/img]</div></td></tr>

<tr> 
          <td height="21"><div align="center">[img]emoticons/em13.gif[/img]</div></td>
          <td height="21"><div align="center">[img]emoticons/em14.gif[/img]</div></td>
          <td height="21"><div align="center">[img]emoticons/em15.gif[/img]</div></td>
          <td height="21"><div align="center">[img]emoticons/em16.gif[/img]</div></td>
          <td height="21"><div align="center">[img]emoticons/em17.gif[/img]</div></td>
          <td height="21"><div align="center">[img]emoticons/em18.gif[/img]</div></td>

        </tr>
      
</table>
      
 <table width="208" align="center" bordercolor="#000000" bgcolor="#E7E9FA" style="border:1px solid;">
        <tr> 
          <td height="21" bgcolor="#BBC2F2"><div align="center"><font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">[b]MESSAGGIO[/b]</font></div></td>
        </tr>
        <tr> 
          <td ><form method="GET" action="insert.php" name="form_ins" >
              <table width="170" border="0" align="center">
                <tr> 
                  <td colspan="2"><div align="center"> 
                      <textarea rows="3" onKeyDown="textCounter(this.form.messaggio,this.form.rem,400);" onKeyUp="textCounter(this.form.cjmsg,this.form.rem,400);" cols="19" type="text" name="messaggio"></textarea>
                    </div></td>
                </tr>
                <tr> 
                  <td><div align="right"><font size="1" face="Verdana, Arial, Helvetica, sans-serif">Lettere 
                      rimaste:</font></div></td>
                  <td><div align="center"> 
                      <input readonly class="stile" type=text name=rem size=3 maxlength=3 value="400">
                    </div></td>
                </tr>
                <tr> 
                  <td height="26" colspan="2"> <div align="center"> 
                      <? 
                     
echo "<input type=\"hidden\" name=\"nick\" value=\"$nick\">";
                     echo 
"<input type=\"hidden\" name=\"password\" value=\"$password\">" 
                     
?>
                      <input type="submit" name="Submit" value="Invia messaggio">
                    


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




</table>
            </form></td>
        </tr>
      </table>
</body>
</html>
login.php:
Codice PHP:
<html>
<
head>
<
title>Login alla chat</title>
<
meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</
head>

<
body bgcolor="#FBBEAA">
<
table width="208" align="center" cellpadding="4" bordercolor="#000000" bgcolor="#F8EBC2" style="border:1px solid">
    <
tr bgcolor="#F0DBAA"
      <
td colspan="2"
        <
div align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">[b]BENVENUTI 
          IN CHAT
[/b]</font></div></td>
    </
tr>
    <
tr><td>
<
p align="justify">Benvenuti nella chat meteo di Globalmeteoentrando potrete inserire le condizioni meteo 
attuali inerenti alla vostra cittā 
!
</
p>
    </
tr></td></td></table>


<
form method="get" action="chat.php">
  <
table width="208" align="center" cellpadding="4" bordercolor="#000000" bgcolor="#F8EBC2" style="border:1px solid">
    <
tr bgcolor="#F0DBAA"
      <
td colspan="2"
        <
div align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">[b]LOGIN 
          ALLA CHAT
[/b]</font></div></td>
    </
tr>
    <
tr
      <
td colspan="2"><div align="center"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">---------------------------
[
i][b]Se 
          non sei gi
&agraveregistrato 
<font color="#000000">>> <a href="http://www.globalmeteo.altervista.org/chat/register.php">clicca 
          qui
</a> <<[/b][/i][b][/b]</font>
--------------------------- </
font></div></td>
    </
tr>
    <
tr
      <
td width="60"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">[b]Nick:[/b]</font></td>
      <
td><input name="nick" type="text" id="nick" size="14" maxlength="20"></td>
    </
tr>
    <
tr
      <
td><font size="2" face="Verdana, Arial, Helvetica, sans-serif">[b]Password:[/b]</font></td>
      <
td><input name="password" type="password" id="nick3" size="14" maxlength="20"></td>
    </
tr>
    <
tr
      <
td colspan="2"><div align="center"><input type="submit" name="Submit" value="Entra in chat"></td>
         </
tr>
  </
table>
</
form>


<
div align="center"><a href="http://www.globalmeteo.altervista.org/reg.html">
<
font size="2" face="arial">[b]Leggi il regolamento della chat</font>[/b]</a>


_________________________

<font size="2" face="arial">Ci sono 23 utenti registrati
</body>
</
html
e messaggi.php:
Codice PHP:
<html>
<head>
<title>Messaggi degli utenti</title>
<?
include("config.php");
echo 
"<meta http-equiv=\"refresh\" content=\"$time_refresh\">";
?>
<script language="javascript">
function apri(nick_ut)
{
window.open("profilo.php?nick=" + nick_ut,nick_ut,"width=500, height=300, left=200");
}
</script>


</head>

<body>
<?
if (!(file_exists($file_mess)))
{
fopen($file_mess,"w");}

$rows_file=file($file_mess);
$rows_file_ord=array_reverse($rows_file);
$count=count($rows_file_ord);

if (
$count<$num_messag)
{
for (
$i=0;$i<$count;$i++)
{
$dati_utente=explode("|",$rows_file_ord[$i]);
$nick=$dati_utente[0];
$msg=$dati_utente[1];

$nick=stripslashes($nick);
$msg=stripslashes($msg);

$msg str_replace('[em1]','[img]emoticons/em1.gif[/img]',$msg);

for (
$x=1;$x<19;$x++)
{
$img="em".$x;
$img2="[".$img."]";
$path="<img src=\"emoticons/$img.gif\">";
$msg str_replace("$img2","$path",$msg);
}
echo 
"[b]<font face=\"verdana\" size=\"2\" color=\"#000000\">$nick</font>: [/b]"."<font face=\"verdana\" size=\"2\">".$msg."</font>
"
;
}
}
else
{

for (
$i=0;$i<$num_messag;$i++)
{
$online_ut[$i]=$rows_file_ord[$i];
$dati_utente=explode("|",$rows_file_ord[$i]);
$nick=$dati_utente[0];
$msg=$dati_utente[1];

$nick=stripslashes($nick);
$msg=stripslashes($msg);

for (
$x=1;$x<19;$x++)
{
$img="em".$x;
$img2="[".$img."]";
$path="<img src=\"emoticons/$img.gif\">";
$msg str_replace("$img2","$path",$msg);
}

echo 
"[b]<font face=\"verdana\" size=\"2\"><font face=\"verdana\" size=\"2\" color=\"#000000\">$nick</font>: [/b]"."<font face=\"verdana\" size=\"2\">".$msg."</font>
"
;
}
$online_ut=array_reverse($online_ut);
fopen($file_mess,"w");
$ins_msg=fopen($file_mess,"a+");
for (
$i=0;$i<$num_messag;$i++) fwrite($ins_msg,$online_ut[$i]);
fclose($ins_msg);
}
?>

</body>
</html>
spero che qualcuno m'aiuti ciao!!!