if you are using prototype:

<script type="text/javascript">

        function myfunction(){

                var el = $('myInput').value; //gets the value of the drop down

                if(el == 'select'){
                        $('mytext').style.display = "";
                }

        }

</script>

<select id="myInput" onchange="myfunction()">
        <option>textarea</option>
        <option>string</option>
</select>

<!-- HIDDEN TEXTAREA -->

<textarea id="mytext" style="display:none"></textarea>

On Apr 29, 6:48 am, seb <[EMAIL PROTECTED]> wrote:
> Conceptually, this can be done this way :
>
> For the options your users should enter, enclose a textarea field inside
> a DIV that is by default on visibility:hidden CSS style.
>
> On the dropdown, trigger the onChange Javascript event to check out if
> the 'dropdown' option is selected. If yes, change dynamically the
> visibility style of the textarea to "visible" using Javascript.
>
> That should do the job !
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