can you evaluate my code

<? 
$username=$_POST["username"];
?>


<TR>
<TH align = left>Soups,Mazza, and juices</TH>
</TR>

<TR>
    <TH align = left>Pasta</TH>
.
.
.

<?
$fno=$_GET['f_no']; 
$username=$_GET['username']; 
?>

<form method="get" action="PostTopic.php">


 <input type="hidden" value="newtopic"  name = "mode"> </p>


 <input type="hidden" value="<? echo $fno ?>" name = "f_no"> </p>


 <input type="hidden" value="<? echo $username ?>" name = "username"> </p>


<input type="submit" value="New Topic" name="newtopic"></p>
</FORM>

<?
$database="formdb";
mysql_connect(localhost);
@mysql_select_db($database) or die ("Unable to select database");
$query="select * from forums where f_no = '$fno'";
$res=mysql_query($query);
$fname=mysql_result($res,0,"f_name");
?>

// here to display Forums -> Soups,Mazza, and juices

 Forums -> 
<?
echo "    ".$fname."
";
?>

// to get username, f_no (forum no)
<?
extract($_GET);
?>

<FORM METHOD=POST ACTION="postnew.php">
<INPUT TYPE="text" NAME="Ttitle">

<TEXTAREA NAME="texta" ROWS="20" COLS="60"></TEXTAREA>

<input type = "hidden" name ="f_no" value ="<? echo $f_no ?>" >
<input type = "hidden" name ="username" value ="<? echo $username ?>" >
<input type="submit" name ="submit" value ="Submit">

</FORM>

your topic is applied</p>

<?
extract($_POST);
$database="formdb";
mysql_connect(localhost);
@mysql_select_db($database) or die ("Can not connect to database");

$sql="insert into topics values('','$f_no','$username',now(),'$Ttitle','$te  xta','1')";
mysql_query($sql)or die ('cannot insert because  '.mysql_error());
mysql_close();
?>