Código HTML:
<script language="javascript"> function abrir(pid){ getElementByID(pid).style.display="block"; } </script> <table border="0"> <tr> <td><div align="center"><a href="javascript:abrir(1)"><img src="img/img/1.jpg" width="88" height="50" /></a></div></td> </tr> <tr> <td class="Estilo1"><div id="1" style="display:none" align="center"> <textarea name="textfield" cols="50" rows="5" id="textfield"></textarea> </div></td> </tr> </table>