AJAX Help

<script type="text/javascript">
function deleteB()
  {
  var del;
  try
    {
    // Firefox, Opera 8.0+, Safari
    del=new XMLHttpRequest();
    }
  catch (e)
    {
    // Internet Explorer
    try
      {
      del=new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e)
      {
      try
        {
        del=new ActiveXObject("Microsoft.XMLHTTP");
        }
      catch (e)
        {
        alert("Your browser does not support AJAX!");
        return false;
        }
      }
    }
        del.onreadystatechange=function()
      {
      if(del.readyState==4)
        {
        alert(del.responseText);
        }
      }
    del.open("GET","/admin/deleteblog.php?<?php $id = $_GET['id']; echo $id ?>",true);
    del.send(null);
  }


</script>
</head>
<?php include('pieces/nav.php'); ?>
<form name="delete">
<p><input type="submit" name="delete" onClick="deleteB();" value="DELETE!" /></p>
</form>

<?php 
include('../library/corefiles/blog.php');
session_start();
if ($chk->checkType() == 3) {
    $id = $_GET['id'];
    blog->deletePost($id);
    echo $id.'Was Deleted';
    }
    
?>

if(del.readyState==4)
{
if (del.status == 200) // good response from server     
alert(del.responseText);
else
alert(del.statusText) // What happened?
}