uso de ajax en la eliminación de una fila

I have a webpage that has several rows of data coming in mysql database. Im new to ajax i just try it right now, because of the reason that i want to delete row without refreshing the web page. I just want to ask if my code in ajax is correct or did I use it right. here is my code.

this is the generating of rows

            mysql_connect("localhost","root","");
            mysql_select_db("eis");
            $e=0;
            $d = mysql_query("select * from hrd_ot");   

            while($x=mysql_fetch_array($d)){
            $e++;
                print"<tr id='row".$e."'>
                <td>{$x['nam']}</td>
                <td>{$x['dep']}</td>
                <td>{$x['job']}</td>
                <td>{$x['dateofot']}</td>
                <td>{$x['frt']}</td>
                <td>{$x['tot']}</td>
                <td>{$x['toh']}</td>
                <td>{$x['app']}</td>
                <td><a href='#' onclick=\"return samplexx(".$x['id'].",row".$e.")\">OK</a></td>
                </tr>";}

and here is my ajax script | source http://www.w3schools.com/ajax/ajax_xmlhttprequest_onreadystatechange.asp

<script>
function samplexx(id,row)
{
    var xmlhttp;
    if (window.XMLHttpRequest)
      {// code for IE7+, Firefox, Chrome, Opera, Safari
      xmlhttp=new XMLHttpRequest();
      }
    else
      {// code for IE6, IE5
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    xmlhttp.onreadystatechange=function()
      {
        row.style.display="none";
      }
    xmlhttp.open("GET","sample.php?id="+id,true);
    xmlhttp.send(); 
}   
</script>

and here is my sample.php

mysql_connect("localhost","root","");
mysql_select_db("eis");

mysql_query("delete from hrd_ot where id='{$_GET['id']}'");

also it is possible the row that i've choose to delete will delete without using this line of code row.style.display="none";