How do I change the email address linked to Picassa?

I started using Picassa web albums with this one gmail account that I don't use anymore. I want to delete it, but I need to save my pictures! I have another gmail that I want to use instead of my old one- is there any way to change the email address associated to Picassa or would I just have to reupload everything?How do I change the email address linked to Picassa?Upload everything again

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