cookies, sessions?

login.php

<?php 
header("Content-type: text/vnd.wap.wml"); ?>
<?xml version="1.0"?><!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.xml"> 
<wml> 
  <card id="card1" title="Nokia" newcontext="true"> 
    <p align="center"><b>Login</b><br/><br/></p>
	<p>
      Username: 
      <input name="username" size="10" />
      <br/>
      Password: 
<input type="password" name="password" size="10" maxlength="20"/><br />
      <anchor>
        Submit
        <go href="verify.php" method="post">
          <postfield name="username" value="$(username)"/>
          <postfield name="password" value="$(password)"/>
        </go>
      </anchor>
    </p>
  </card> 
</wml> 

----------------------------

verify.php

<?php 

session_start();  

header("Content-type: text/vnd.wap.wml"); 

echo "<?xml version=\"1.0\"?>"; 
echo "<!DOCTYPE wml PUBLIC \"-//WAPFORUM//DTD WML 1.1//EN\" \"http://www.wapforum.org/DTD/wml_1.1.xml\">"; 

echo "<wml>"; 
echo "<card id=\"card1\" title=\"Nokia\">";      
echo "<p>";
        if ($username==NULL && $password==NULL)
        {
            echo"Please Try Again!!!<br/>";
            echo"NO Username & Password<br/>";                       
            echo "Click <a href=\"login.php\">here</a> to try again !!<br/>";
            }
        else
        {        
            $Connect = mysql_connect("localhost","root","");
            mysql_select_db("wap");
            $check == 0;
            $result=mysql_query("select * from account");
            $number_of_rows = mysql_num_rows($result);
            $i=0;
            $check=0;
            while ($number_of_rows != 0)
            {
               $row = mysql_fetch_row($result);
               $number_of_rows--;
               if ($username==$row[0] && $password==$row[1]) 
  { 
     session_register('username'); 
     session_register('password'); 
     $_SESSION['username'] = $row[0]; 
     $_SESSION['password'] = $row[1]; 
      
     echo"Congratulations !!<br/>"; 
     echo "Hello!! <b>" . $_SESSION['username'] . "</b><br/>"; 
     echo"You had access Nokia website<br/>"; 
     echo "Click <a href=\"welcome.php\">here</a> to CONTINUE !!<br/>"; 
     $check=1; 
     break; 
} 
               }               
               if ($check == 0)
                {
                    echo"Please Try Again!!!<br/>";
                    echo"Wrong Username OR Password<br/>";                       
                    echo "Click <a href=\"login.php\">here</a> to try again !!";
                }
            }
echo "</p>"; 
echo "</card>"; 
echo "</wml>"; 
?>