My plan is VPS. When I try to login VZ or Plesk, the https give me the warning

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There is a problem with this website's security certificate.
 
The security certificate presented by this website was issued for a different website's address.

Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server. 
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I don't have my own certificate and I understand this is because of shared certificate from Lunarpages.

But the problem is my customer will also be warned when they use Plesk. Is there anyway to remove the certificate or make the warning invisible? IE and Firefox always show the warning even I can see the certificate has already be stored.

Thanks.