This example allows you to write a customizable guestbook for a web site. A guestbook is an HTML form in which the user indicates his or her name and some comments. The guestbook can be used for collecting feedback on a topic, as a simple message board, or for submitting problems to a help desk. The data is kept in a file and can be displayed after the form is filled out; it also can be displayed on a page of its own.
Listing 22.7 provides a short bit of HTML to present a guestbook form for a fictional help desk. You can modify the form to suit your own needs.
Listing 22.7. Help Desk Form
1: <form action="/cgi-bin/helpdesk.cgi" name="helpdesk">
3: Problem type:
4: <input type="radio" name="probtype" value="hardware"/>Hardware
5: <input type="radio" name="probtype" value="software"/>Software
7: <textarea name="problem" rows="10
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