can help me add the javascripts for the part Total ticket price?


<h2>Purchase Concert E-Ticket</h2>
<form name="order" id="order" >
Concert Date: <input name="cdate" id="cdate" type="date" /> <br/><br/>
Showtime:
<input type="radio" name="time" id="6.00pm-9.30pm" />6.00pm-9.30pm
<input type="radio" name="time" id="7.00pm-10.30pm " />7.00pm-10.30pm <br/><br/>

Concert Title:
<select name="concertTitle" id="title">
<option>Select Concert</option>
<option value="title1">Aladdin (RM100)</option>
<option value="title2">Music Festival (RM200)</option>
</select><br/><br/>

Quantity :
<select name="quantity" id="qty">
<option>Select Quantity</option>
<option value="qty1">1</option>
<option value="qty2">2</option>
<option value="qty3">3</option>
<option value="qty4">4</option>
<option value="qty5">5</option>
<option value="qty6">6</option>
<option value="qty7">7</option>
<option value="qty8">8</option>
<option value="qty9">9</option>
<option value="qty10">10</option>
</select><br/><br/>

<input type="submit" value="Buy Concert E-Ticket" />
<input type="reset" value="Cancel" /> <br/>
</form>​