Modified the Javascript and PHP to use AJAX

When submit button is pressed, an HTTP request is sent to the PHP file with the
form data.  The PHP file dumps the $_POST array, allowing the JavaScript file to
pick it up and add it to the HTML.
Comments are added to database

Information from the form is sent via POST request, checked for validity, and
inserted into the database via an SQL query.

The current URL is now sent with the POST request, so that its md5 hash can
be used as a table name.
Added invalid email checking and sanitization of name, email, and message
Better form submittion POST replies and started comment display code

The form submition post requests now return JSON files with a "valid" status and
a message.  If the status is set to true, the JavaScript replaces the submission
form with a success message.  If it's false, an error message is displayed in an
alert.

Added sanitization for the URL in the form submission POST request.

Began implementing the displayComments app.  At this point, the app gets all the
data from the table as arrays representing rows until there are no rows left. It
then var_dumps the row arrays.

In the JavaScript, began implementing the second half of the display function,
which will display the comments.  Currently creates the comments div and makes
the POST request which will eventually return the code for each comment's div.
Also currently appends the var_dumped data to the comments div.