PHP remember Form-button data to insert into form field

Question

Hi,
I am creating a book website where people can reserve books (one at a time).
Basically what I want to do is have a reserve button under each book which contains hidden values (the title and author of the book) and when they click on the button they will be taken to a 'reserve book' page with a form on it where they will have to fill out their details. However I want the book title and author to automatically be entered into the appropriate fields, so to save the users from having to do it themselves.
I'm sure this is possible with PHP, but not sure how to go about it in the right way.
I would appreciate any help with this.
Thanks

Answer 1

Thanks for that, however I can't seem to get the first part of the code right. I have the following:
Reserve book button:
               <form action="reserve.php" method="post">
                    <input type="hidden" name="bookName" id="bookName" value="Eclipse" />
                    <input type="hidden" name="author" id="author" value="Stephenie Meyer" />
                    <input class="button" type="image" value="send" alt="reserve" src="images/reserve.gif" width="81" height="22"/>
                </form>
Reserve book form:
   <form action="process-form.php" method="post">
              <label for="name">Your Full Name:*</label>
             <input type="text" name="name" id="name" />
              <label for="telephone">Tel no:*</label>
              <input type="text" name="telephone" id="telephone"  />
              <label for="email">Email:*</label>
              <input type="text" name="email" id="email"/>
              <label for="Title">Book Title:*</label>
              <input type="text" name="book_title" size="25" value="<?php echo $bookName ?>" />
              <label for="Author">Author:*</label>
              <input type="text" name="author" size="25" value="<?php echo $author ?>" />
              <input class="button" type="image" value="send" alt="reserve" src="images/reserve.gif" width="81" height="22"/>         
            </form>