javascript - Pop Up form before Executing PHP Function -

what want achieve :

1. a user enters page called (certificate search)
2. html form asking fname, lastname , , serial number.
3. when user clicks 'submit' , form method 'get' send data php query database display data based on details in form.
4. i want each time user click 'submit' there pop form . (preferably input fields name , company name , email address , on, , form send data , data html form before e-mail address . user has complete form before proceeding view results. )

any please? or willing point me right direction?

my html page @ moment :

<? php code receive fname,lname , serial html form ?> <h2>search certificate holder details through our databases below :</h2> &nbsp;  please enter exact :  <form action="" method="get"> <input type="text" name="fname" placeholder="first name" /> <input type="text" name="lname" placeholder="last name" />  exact 8-digit serial number:<input type="text" name="serial" /> <input type="submit" name="submit1" value="search" />  </form>&nbsp;