放<a> Tag in Tag

Question

i must to put this Tag

 <td><a id="<?php echo "pdf_file_".$id; ?>" style="color: black;" href="<?php echo $dateiinfo['dirname']."/".$dateiinfo['basename'];?>" ><?php echo $dateiinfo['filename']; ?> <br></a></td>

in a Tag:

<td id="org"><br></td> 

How can i make this?

i try it with that

org.appendChild( getElementById($id) );
org.removeChild( getElementById($id) );