add name to textbox entry

Hi,

I am using cakephp and I want to click a button and a database field appears on the text area .
I just need to know how to use javascript to add  string to a text area . This is a js issue and not a cakephp

This is the textbox I have already which works fine along with the js not listed here

 echo $this->Form->input('message',  array('label'=>'Message','value'=>'','name'=>'message',
                       'type' => 'textarea','style'=>'width:300px; height:200px;',
                        'OnKeyUp'=> 'limitText(this.form.message,this.form.countdown2,150)',
                        'OnKeyDown'=> 'limitText(this.form.message,this.form.countdown2,150)'));

Select allOpen in new window