how to dynamically add text boxes with add and remove link based on drop down choices,only if a particular choice is selected.

how to dynamically add text boxes with add and remove link based on drop down choices,only if a particular choice is selected. for eg when i click married it shud display dynamically a dropdown and textbox.
I m new to java code.plz help me how to do.any help will be appreciable.

<td><label>Martial Status</label></td>
<td><select name="martial_stat" value="utype" style="width:65px;">
<option value="None" selected="selected">None</option>
<option value="Married">Married</option>
<option value="Single">Single</option>
</select>