Adding code selection button to postbit?

[Simon Lloyd]

Hi all, i am trying to add a button to the postbit template where a user can highlight all the code in a code textbox with one click, i am trying to use this:

 <input type="button" value="Highlight Text" onClick="javascript:this.form.text_area.focus();this.form.text_area.select();">

which came from this

<form name="select_all">

<textarea name="text_area" rows="10" cols="80">
MY TEXT TO HIGHLIGHT</textarea>

<br />
<input type="button" value="Highlight Text" onClick="javascript:this.form.text_area.focus();this.form.text_area.select();">

</form>

How would i change the <input line to focus the code box?