How to give id to the TinyMCE Editor - php

Question

I am trying to develop an application in which "When I select option from dropdown the below fields should fill automatically(One is text field and other is TinyMCE Esitor)".
Below is the code I tried.
<?php
defined('_JEXEC') or die('Restricted access');
?>
<script type="text/javascript">
function showTemplate()
{
document.getElementById("jform_page_title").value = document.getElementById("jform").value;
alert("clicked");
}
</script>
<form action="" method="post" name="adminForm" id="adminForm">
<table class="admintable">
<tbody>
<tr>
<td>
<label for="jformid"><?php echo JText::_('JTAG_LEGAL_PAGES_CHOOSE_TEMPLATE');?>
</label>
</td>
<td>
<select id="jform" onchange="showTemplate()">
<?php foreach($this->templates as $template): //print_r($template);exit; ?>
<option value="<?php echo $template->id; ?>"> <?php echo $template->template_title; ?></option>
<?php endforeach; ?>
</select>
</td>
</tr>
<tr></tr>
<tr>
<td>
<label for="jform_page_title"><?php echo JText::_('JTAG_LEGAL_PAGES_TEMPLATE_TITLE'); ?></label>
</td>
<td>
<input type="text" size="30" class="inputbox required" id="jform_page_title" value="<?php echo $this->template->template_title; ?>" name="jform[page_title]" />
</td>
</tr>
<tr></tr>
<tr>
<td>
<label for="jform_description"><?php echo JText::_('JTAG_LEGAL_PAGES_TEMPLATE_DESCRIPTION'); ?></label>
</td>
<td>
<?php
$editor =& JFactory::getEditor();
echo $editor->display('jform[description]', htmlspecialchars($this->lpsettingdata->description, ENT_QUOTES),'550','300','60','20',array('pagebreak','readmore'));
?>
</td>
</tr>
</tbody>
</table>
<input type="hidden" value="<?php echo $this->lpsettingdata->id; ?>" name="jform[id]" />
<input type="hidden" name="task" value="" />
<input type="hidden" name="controller" value="jtaglegalpages" />
</form>
Please let me know how to give id to the editor.