Mix SSL certificates

I'd like to have a SSL certificate for domainA that load images from domainB (I load them from another cookieless domain to improve page speed). I know that all elements coming from domainB should be ove开发者_运维问答r SSL, but do i need to secure this second domain with a certificate coming from the same provider? I mean, could I mix a page with a ie verisign certificate with images coming over SSL from another domain with a different - and cheaper - certificate?

Yes, it will work and show no error in the browser. It's the same if you for example include Google Fonts (via e.g. https://fonts.googleapis.com) or Bing Maps using their SSL certificates. There shouldn't be a problem.