Need help with form

I have searched and can't find anything to help me. I want to make it so if the element "satisfaction" is either x or y then it will display element "testimonial" if not then keep element "testimonial" hidden. This is what I have so far but it isn't working. Any help would be greatly appreciated

<form id="feedback-form" method="post" action="contactvalidate.php" action="javascript:alert('success!');">


			<label>Name</label><input class="required inpt" type="text" name="name" value="" /><br />

			<label>Company Name</label><input class="required inpt" type="text" name="companyname" value="" /><br />

			<label>E-Mail</label><input class="required inpt" type="text" name="email" value="" /><br />

			<label>Phone Number</label><input class="required inpt" type="text" name="phone" value="" /><br />

			<label style="margin-bottom:10px">Have you ordered from us?</label><input class="radio" type="radio" name="order" value="Yes" />Yes <input class="radio" type="radio" name="order" value="No" />No<br />

			<label>Your level of satisfaction</label>

				<select name="satisfaction" id="satisfaction" class="select">

					<option value="">--Select One--</option>

					<option value="Very Satisfied">Very Satisfied</option>

					<option value="Moderately Please">Moderately Pleased</option>

					<option value="Somewhat Dissatisfied">Somewhat Dissatisfied</option>

					<option value="Very Dissatisfied">Very Dissatisfied</option>

				</select><br />

			<!--  <input class="required inpt" type="text" name="subject" value="" /> --><br />

			<label>Comments</label><textarea class="textbox" name="message" rows="6" cols="30"></textarea><br />

			<label>Is it okay for us to use your comments as a testimonial in our marketing?</label><input class="radio" type="radio" name="testimonial" value="Yes" />Yes <input class="radio" type="radio" name="testimonial" value="No" />No<br />

			<label id="load"></label><input name="submit" type="image" class="btn" src="images/submit.gif" value="Send" />


		</form>

<!--end #footer--></div>

      

<script type="text/javascript">

function getIndex()

{

  var x=document.getElementById("satisfaction");

  if (x.selectedIndex == 'Very Satisfied' , 'Moderately Please');

   {

    $('#testimonial').show();

   }

  else

   {

    $('#testimonial').hide();

   }

}

</script>