Oh, sorry about that, I didn't put 2 and 2 together when you asked about Expression web. I was giving you instructions on how to do this with Dreamweaver.
We use Spry to validate the fields, but Expression Web doesn't recognize this. You can manually remove this line of code on the contactus.php page:
<span class="textareaRequiredMsg">A value is required.</span>
Make sure you leave the second closing span tag on that line.
Also you will need to modify this line of code:
var sprytextarea1 = new Spry.Widget.ValidationTextarea("sprytextarea1", {validateOn:["blur"]});
to look like this:
var sprytextarea1 = new Spry.Widget.ValidationTextarea("sprytextarea1", {validateOn:["blur"], isRequired:false});