Sets a query parameter to a single value and returns a hidden text field containing that parameter and its new value.
I've not looked at all the places in the code where this is called, but I am actually wondering whether this function was written by someone who didn't know you could do $q->hidden("name", "value") Doing it the current way means that there is a side-effect on the global variable $q -- if this is intentional then it should be documented, and if not then it should possibly be fixed as it might come back to bite us in the future.
$name, $value
Returns precisely $q->hidden("name", "value") but also has a side-effect on the global CGI object $q
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