it should be really easy to do..
<a href="search.php?&action=finderuser&userid=userinf o[userid]>Posts</a> (put the post count here to display number of posts)
blah I cannot type html or anything here at work, can't remember.. hehe
but if you need help I am sure I can help ya, or someone else around here can right off the bat
as for advancing to have error messages and everything that should be able to be done through a simple if else statement I would think anyways..
but I think a lot but make sense very little