team this is my first time here and my first html/javascript
but it doesnt wana work could someboday show me my mistake thx

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Reservation Form</title>
</head>

<body>
<form action="res.php" method="post" name="pricecheck">
<input type="text" value="Limousine" disabled="disabled" />
<br>
<table width="352" border="3" cellspacing="1" cellpadding="3">
<tr>
<td><strong>Party size/strong></td>
<td>
<select name="pasn" id="pasn" size="1">
<option value="0"></option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
</select>
</td>
</tr>
<tr>
<td><strong> Trip Type/strong></td>
<td>
<select name="tt" id="tt" size="1">
<option selected="">Select One</option>
<option value="One Way">One Way</option>
<option value="Round Trip">Round Trip</option>
<option value="Land&amp;Sea/Sea&amp;Land">Land&amp;Sea/Sea&amp;Land</option>
</select>
</td>
</tr>
<tr>
<td><strong>Transfare type</strong></td>
<td>
<script type="text/javascript">
if(tt="One Way")
{
<select name="trant1" id="trant" size="1">
<option>Select One</option>
<option value="12">MCO To Disney</option>
<option value="13">Disney To MCO</option>
<option value="14">MCO To Cruis</option>
<option value="15">Cruis To MCO</option>
<option value="16">Disney To Cruis</option>
</select>
}else if (tt="Round Trip")
{
<select name="trant2" id="trant" size="1">
<option>Select One</option>
<option value="17">MCO To Disney To MCO</option>
<option value="18">MCO To Cruis To MCO</option>
<option value="19">Disney To Cruis To Disney</option>
<option value="20">Dsiney To Cruis To MCO</option>
}else (tt="Land&amp;Sea/Sea&amp;Land")
{
<select name="trant3" id="trant" size="1">
<option>Select One</option>
<option value="21">MCO To Disney to Cruis To MCO</option>
<option value="22">MCO To Cruis To Dsiney to MCO</option>
}
</script>
</td>
</tr>
</table>

</form>
</body>
</html>

thx again