php - Edit row of table with ajax (no jquery) -

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i want change row numbers 1, 2 , 3 number 4, 5 , 6 ajax (no jquery) when push button. how can it? because code can't.

this main .php:

<!doctype html> <html>     <head>         <title>hola mundo con ajax</title>         <script>             function loadxmldoc()             {                 var xmlhttp;                 if (window.xmlhttprequest)                 {                     // code ie7+, firefox, chrome, opera, safari                     xmlhttp=new xmlhttprequest();                 }                 else                 {                     // code ie6, ie5                     xmlhttp=new activexobject("microsoft.xmlhttp");                 }                  xmlhttp.onreadystatechange = function()                 {                      if (xmlhttp.readystate==4 && xmlhttp.status==200)                     {                         document.getelementbyid("mydiv").innerhtml=xmlhttp.responsetext;                     }                 }                 xmlhttp.open("get","carga.php",true);                 xmlhttp.send();             }         </script>     </head>     <body>         <table>             <tr>                 <td bgcolor="#d6d6d6">field 1</td>                 <td bgcolor="#d6d6d6">field 2</td>                 <td bgcolor="#d6d6d6">field 3</td>             </tr>             <tr>                 <div id="mydiv"><td>1</td>                 <td>2</td>                 <td>3</td></div>             </tr>         </table>         <button onclick="loadxmldoc()">cambio</button>     </body> </html>

this cargar.php:

<?php echo "<td>4</td>     <td>5</td>     <td>6</td>";  ?>

try this:

<!doctype html> <html>     <head>         <title>hola mundo con ajax</title>         <script>             function loadxmldoc()             {                 var xmlhttp;                 if (window.xmlhttprequest)                 {                     // code ie7+, firefox, chrome, opera, safari                     xmlhttp=new xmlhttprequest();                 }                 else                 {                     // code ie6, ie5                     xmlhttp=new activexobject("microsoft.xmlhttp");                 }                  xmlhttp.onreadystatechange = function()                 {                      if (xmlhttp.readystate==4 && xmlhttp.status==200)                     {                         document.getelementbyid("mytable").tbodies[0].innerhtml+=xmlhttp.responsetext;                     }                 }                 xmlhttp.open("get","carga.php",true);                 xmlhttp.send();             }         </script>     </head>     <body>         <table id="mytable">             <tbody>                 <tr>                     <td bgcolor="#d6d6d6">field 1</td>                     <td bgcolor="#d6d6d6">field 2</td>                     <td bgcolor="#d6d6d6">field 3</td>                 </tr>                 <tr>                     <td>1</td>                     <td>2</td>                     <td>3</td></div>                 </tr>             </tbody>         </table>         <button onclick="loadxmldoc()">cambio</button>     </body> </html>

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