To understand why the update block is not being executed add a debug line into the else part.

} else {
  $msg = "Please complete form";
  $msg.= "<br/>Debug : action=[$action] empid=[$empid]";
}
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You will have to change the regex $empid =~ /\d+/ in the if() to some other pattern if your EmployeeID's don't contain a number, or maybe just use $empid ne ''
poj