how to (if possible) create a SSL certificate for only one website on my apache2 server?

how to (if possible) create a SSL certificate for only one website on my
apache2 server?

I saw some similar posts like this , but it didn't help me at my exact
problem. So I am using ubuntu 12.04 on a server with apache2 on it. There
are like 5 websites which are Virtualhosts and Namebased running on it
(using the same port). Now I need another page whiche REQUIRES a SSL
certificate. Is it possible to run just the one page under ssl or do I
automatically load everything in it when I configure SSL ?
I know that I have to put the SSL server under Port 443 like this :
<virtualhost *:443>
SSLEngine On
SSLCertificateFile /path/to/your/sslcert
DocumentRoot /path/your/webcontent
</virtualhost>
Does anyone know and want to explain me, how to setup ssl for just one page?