Help plz DUAL Login within same form

hi

<form name="theform" method="post" action="index.asp">
<p>Username: <input name="username" size="18" type="text"><br />
Password: <input name="password" size="18" type="password"><br />
Type 1 Login page<input name="logintype" value="1" type="radio">Type 2 Login Page<input name="logintype" value="2" type="radio"><br />
<input name="Submit" value="Submit" type="submit">
</form>

this is a form
i needed help this way

when i select the Value=1 radio button it should post in login1.asp page
and when value=2 radio button is selected. it should post in login2.asp page

Plz help

Regards,
ARVIND

[script]
if check radio1 is selected then
form.action=login1.xxx
else if check radio2 is selected then
form.action-login2.xxx
[/script]