Help needed asap

What's wrong with this statement -
<a href=javascript:window.location.href="http://domain.co.uk/?productID=<?=$productID?>&color="+colorvalue()+'&prv'+prv();>Continue...</a>

It works if I get rid of the last +prv(), but as soon as I add it in it does nothing. Anyone knows how to deal with this?


Thanks!!!

prv() is a function, not a value.

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