I'm pretty new to AJAX so this may look like simple questions but..., so i want my file to be stored in a table in a db i have on my localhost, i'm using iframe

<iframe id="upload_target" name="upload_target" src="#" style="width:0;height:0;border:0px solid #fff;"></iframe>

what source do i provide, what about the id? and this is the php code , what path do i provide in th destination path?

   // Edit upload location here
   $destination_path = ;
   $result = 0;
   $target_path = $destination_path . basename( $_FILES['myfile']['name']);
   if(@move_uploaded_file($_FILES['myfile']['tmp_name'], $target_path)) {
      $result = 1;
<script language="javascript" type="text/javascript">window.top.window.stopUpload(<?php echo $result; ?>);</script>