I wanted to make a text box, and the user put data into it, hit search, and have it post back to the page the data it found, i cant figure it out, any help?

PHP Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
</head>

<body>

<?php 
  require_once ('connect.php'); 
  require_once ('opendb.php'); 
  $query = "SELECT * FROM search_data"; 
  $result = @mysql_query ($query); 
  $count = mysql_num_rows($result); //number of results 

  if ($count > 0){ 
    echo "found $count results.<br /><br />\n"; 
    while($row = mysql_fetch_array($result, MYSQL_ASSOC)){ 
      echo ' <tr><td align="left">' . $row['zipcode'] . '</td><td align="left">' . $row['redirect_url'] . '</td></tr>'; 
    } 
  }else{ 
    echo "No results found"; 
  } 
?> 

</body>
</html>