Tagging, switching, and messing up the tag

I have a repository and I've made a tag by copying to a tags
subdirectory the current trunk:

svc ci
svn copy -m "Tagging release 1.5" . http://server/repos/project/tags/1.5

I must have inadvertently switched the wc from trunk to "tags/1.5" some
time in the past so that all subsequent modifications that made up
tags/1.6 and tags/1.7 are based on 1.5 and not on trunk:

[source code modifications]
svn ci
svn copy -m "Tagging release 1.6" . http://server/repos/project/tags/1.6
[source code modifications]
svn ci
svn copy -m "Tagging release 1.7" . http://server/repos/project/tags/1.7

"trunk" is still at "1.5-pre-various-commits" stage.

I know I can merge 1.5 -> 1.7 changes onto the trunk, but my 1.5 tag is
no more the "snapshot" I wanted it to be when I created it.

Here are my questions:
1. How can I get back my original 1.5 tag?
2. Is there a way I can create "uncommittable" tags (copies)?

Thanks.

-- 
Andrea Carpani <andrea.carpani@criticalpath.net>
Critical Path
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