Why did JS on stop working?

Hi,
I have a simple form that needs to display additional fields if visitors select "yes". It worked fine but stopped working.

I don't recall making changes that would have impacted the form and need help.

Will update with link or send entire page if needed.

Thanks,

Sally
____________________________________

The JS functions:

<script type="text/javascript" >
// to display the return trip data if the return trip box is checked //
// DisplayReturn//
function DisplayReturn() {
	var selectreturn = document.getElementById("returntrip");
    if (selectreturn.value=='yes') {
        document.getElementById("returnride").style.display = 'block';
        document.getElementById("returndate").value = '';
        document.getElementById("returntime").value = '';
        document.getElementById("returndate").focus;
    } else {
        document.getElementById("returnride").style.display = 'none';
        document.getElementById("returndate").value = 'n/a';
        document.getElementById("returntime").value = 'n/a';
    }

// get name of Adult at destination for after school //
// DisplayAdultName//
function DisplayAdultName() {
	var selectcp = document.getElementById("AdultAtDestination");
    if (selectcp.value=='yes') {
        document.getElementById("adultnamediv").style.display = 'block';
        document.getElementById("adultname").value = '';
        document.getElementById("adultname").focus;
    } else {
        document.getElementById("adultnamediv").style.display = 'none';
        document.getElementById("adultname").value = 'n/a';
    }
} 

</script>


My form elements:
					<p ><label for="returntrip">Is return car service needed?</label>
					<select name="returntrip" id="returntrip" onchange="javascript:DisplayReturn()" >
						<option value="no">choose</option>
						<option value="yes">yes</option>
						<option value="no">no</option>
					</select> </p>
					<div id="returnride" >
						<p ><label for="returndate">Return Flight Arrival Date</label>
						<input type="text" name="returndate" id="returndate" class="REQUIRED LENGTH_INPUT DATE medium" value="n/a"  placeholder="" />
						</p>
						<p ><label for="returntime">Return Flight Arrival Time</label>
						<input type="text" name="returntime" id="returntime" class="REQUIRED LENGTH_INPUT medium" value="n/a"  placeholder="" />
						</p>
						<p ><label for="returnairline">Return Airline</label>
						<input type="text" name="returnairline" id="returnairline" class="medium"  />
						</p>
						<p ><label for="returnflightno">Return Flight number</label>
						<input type="text" name="returnflightno" id="returnflightno" class="medium"  placeholder="" />
						</p>
						<p ><label for="cellphone">Cell Phone</label>
						<input type="text" name="cellphone" id="cellphone" class="medium"  placeholder="" />
						</p>
					</div>

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