搜索引擎中的自动纠正拼写

I develop web application i have search engine in it . I read the data from database . I built the search engine that can help to complete the word, but need to help to correct the spelling such as i write speeling this word is wrong i want to help and find the correct word such as do you mean spelling such as in Google search engine . help please I saw many links and can't find the right solution.

    <h2>Search</h2> 
  <form name="search" method="post" action="<?=$PHP_SELF?>">
  Seach for: <input type="text" name="find" /> in 
  <Select NAME="field">
  <Option VALUE="fname">diseasename</option>
  <Option VALUE="lname">genename</option>
  </Select>
  <input type="hidden" name="searching" value="yes" />
  <input type="submit" name="search" value="Search" />
  </form>
  </html>
  <?php 
  //This is only displayed if they have submitted the form 
  if ($searching =="yes") 
  { 
  echo "<h2>Results</h2><p>"; 

  //If they did not enter a search term we give them an error 
  if ($find == "") 
  { 
  echo "<p>You forgot to enter a search term"; 
  exit; 
  } 

  // Otherwise we connect to our Database 
  mysql_connect("localhost", "root", "****") or die(mysql_error()); 
  mysql_select_db("database2") or die(mysql_error()); 

There are some more recent tools you may use, for instance the Jquery Spellchecker, PHP Spell Check. You can use the pspell-check function in conjunction with the Aspell library.