javascript onclick append a new row to table
<table id="tbl">
<tr>
<td><input type="text" name="links" /></td>
<td><input type="text" name="keywords" /></td>
<td><input type="text" name="violationtype" /></td>
<td><input type="submit" class="button" value="Add another line" onclick="addField(this);" /></td>
</tr>
</table>