PHP Program Execution

Dear Sir,

I am a beginner in PHP programming and stuck up executing couple of programs. May I request you, help me identifying my mistake?

Regards

Sunita

Program Login.php

<form action="checklogin.php" method="post">
User name : <input type="text" name="name"><br><br>
Passward : <input type="password" name="pwd"><br><br>
<input type="submit">
</form>

====

Program 2-check log in

<?php
$a=$_POST['name'];
$b=$_POST['pwd'];
//echo $a;
//echo $b;
$host="localhost";
$user="root";
$db="test";

$con=mysql_connect("$host","$user","");
mysql_select_db("db",$con);
$query="select * from login where user_name='$a' and pass='$b'";

$sql=mysql_query($query);
echo $sql;
$n=mysql_num_rows($sql);
echo $n

Request your help

Regards

Sunita