Create a form on your website and redirect it to your plesk server:
<form name='klantenlogin' method='post' action='https://XXX.XXX.XXX.XXX:8443/login_up.php3' target='_blank'>
<table border='0' cellpadding="0" cellspacing="0" width='90%' align='left'>
<tr><td> </td><td> </td></tr>
<tr><td> <b>Login: </b></td><td><input name="login_name" type="text" class="small" size="30" /></td></tr>
<tr><td > <b>Password: </b></td><td><input name="passwd" type="password" class="small" size="30" /></td></tr>
<tr><td> </td><td> </td></tr>
<tr><td> </td><td align='right'><i>Log in</i> <input class="contact" value=" " name="Submit" title="Klantenlogin" align="middle" type="image" /> </td></tr>
</table>
If you have multiple servers you can do it in two steps by do an nslookup via php and use the output to fill in the server address.
I'm using this on
http://www.upstream.be/plesklogin.php
- step 1 : filling in the domain
- step 2 : username and password