Well, no--there aren't. In general, the death of the target attribute
is not a bad thing at all; there are a number of drawbacks to using
"target='_foo'" in your pages (most of them related to matters of
accessibility, but some users just find them out-and-out annoying
That said, you could easily invoke a popup script from the <a> tags'
onclick attribute (c.f. scottandrew.com for a quick demo).
Alternatively, if you want to be really sneaky you could use
document.getElementsByTagName in the DOM-intelligent browsers out
there to toss your target back in, and thumb your nose at the W3 all
the while--I've posted a rudimentary example on my site , if it'd
FYI, matters of XHTML/JS are pretty far off-topic for a CSS discussion
list; there are other sites/mailing lists (webdesign-l.org,
devshed.org, etc.) that might be more relevant.
Hope the above (or another reply to your query) is of some help to you.