Changing form action using drop down list

Hi Folks heres what im trying to do i have a form that allows usere to choosse there payment type (1) by cheque (2) by credit card these options are in a drop down list. what i was hoping for was that if they select credit card that it changes the form action to paypal.php or if they select cheque the action changes to cheque.html. SO IS THIS POSSIBLE HMMM.

here is what i have so fare :

<form action=”<?=$paymenttype?>” method=”post”>
<input type=”hidden” value=”Windows Hosting Plan” name=”item_name” />
<input type=”hidden” name=”no_shipping” value=”2″ />
<input type=”hidden” name=”no_note” value=”1″ />
<input type=”hidden” name=”currency_code” value=”EUR” />
<input type=”hidden” name=”lc” value=”IE” />
<input type=”hidden” name=”bn” value=”PP-BuyNowBF” />
<input type=”hidden” name=”cmd” value=”_xclick” />
<input type=”hidden” name=”business” value=”[email protected]” />
&nbsp;
<table width=”100%” border=”0″ cellpadding=”0″ cellspacing=”4″ bgcolor=”#E4EAF4″>
<tbody>
<tr>
<th></th>
<th><strong>Personal</strong> </th>
<th><strong>Basic</strong> </th>
<th><strong>Business</strong> </th>
<th><strong>Enterprise</strong> </th>
</tr>
<tr>
<td>Space </td>
<td>1Gb </td>
<td>2.5Gb </td>
<td>5Gb </td>
<td>10Gb </td>
</tr>
<tr>
<td>Transfer </td>
<td>10Gb </td>
<td>25Gb </td>
<td>50Gb </td>
<td>100Gb </td>
</tr>
<tr>
<td>Monthly </td>
<td>&euro;13.75 </td>
<td>&euro;20.95 </td>
<td>&euro;32.75 </td>
<td>&euro;48.75 </td>
</tr>
<tr>
<td>Annually </td>
<td>&euro;165.00 </td>
<td>&euro;251.40 </td>
<td>&euro;393.00 </td>
<td>&euro;585.75 </td>
</tr>
<tr>
<td>&nbsp;</td>
<td><input type=”radio” value=”165.00″ name=”amount” /></td>
<td><input type=”radio” value=”251.40″ name=”amount” /></td>
<td><input type=”radio” value=”393.00″ name=”amount” /></td>
<td><input type=”radio” value=”585.75″ name=”amount” /></td>
</tr>
<tr height=”60″>
<td>&nbsp;</td>
<td valign=”bottom” colspan=”4″></td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<table cellspacing=”0″ cellpadding=”0″>
<tr>
<td height=”27″ colspan=”2″>Enter your contact information. This is how our support can contact you if needed.</td>
</tr>
<input type=”hidden” value=”submit/signup/ci_info.sbm” name=”template_name” />

<tr>
<td height=”26″>First name</td>
<td><label>
<input name=”first-name” type=”text” size=”30″ />
</label></td>
</tr>
<tr>
<td height=”26″>Last name</td>
<td><input name=”last-name” type=”text” size=”30″ /></td>
</tr>
<tr>
<td height=”28″>Company</td>
<td><input name=”company” type=”text” size=”30″ /></td>
</tr>
<tr>
<td height=”27″>Address 1</td>
<td><input name=”address-line1″ type=”text” size=”30″ /></td>
</tr>
<tr>
<td>Address 2</td>
<td><input name=”address-line2″ type=”text” size=”30″ /></td>
</tr>
<tr>
<td height=”28″>City</td>
<td><input name=”city” type=”text” size=”30″ /></td>
</tr>
<tr>
<td height=”30″>County</td>
<td><select name=”county” size=”1″>
<option selected=”selected”>Select………</option>
<option>Carlow Co.</option>
<option>Cavan Co.</option>
<option>Clare Co.</option>
<option>Cork City</option>
<option>– Cork City North</option>
</select></td>
</tr>
<tr>
<td height=”27″>Postal Code</td>
<td><input name=”post-coade” type=”text” size=”30″ />
(If no post code, enter NA)</td>
</tr>

<tr>
<td height=”27″>Phone</td>
<td><input name=”phonenumber” type=”text” size=”30″ /></td>
</tr>
<tr>
<td height=”26″>e-mail</td>
<td><input name=”email” type=”text” size=”30″ /></td>
</tr>
</table>
<table cellspacing=”0″ cellpadding=”0″>
<tr>
<td width=”133″ height=”34″>Payment type</td>
<td width=”264″><label>
<select name=”paymenttype”>
<option value=”Select”>Please Select One</option>
<option value=”cheque.html”>Cheque</option>
<option value=”paypal.php”>Credit Card</option>
</select>
</label></td>
</tr>
<tr>
<td height=”29″>Billing Period</td>
<td><label>
<select name=”billingperiod”>
<option value=”Select”>Please Select One</option>
<option value=”1 Month”>1 Month</option>
<option value=”1 Year”>1 Year</option>
<option value=”2 Years”>2 Years</option>
<option value=”5 Years”>5 Years</option>
<option value=”10 Years”>10 Years</option>
</select>
</label></td>
</tr>
</table>
<p>&nbsp;</p>
<p><br />
<input name=”submit” type=”submit” onclick=”MM_validateForm(‘first-name’,”,’R’,’last-name’,”,’R’,’address-line1′,”,’R’,’city’,”,’R’,’phonenumber’,”,’RisNum’,’email’,”,’R’);return document.MM_returnValue” value=”Next …” />
</p>
</form>

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