Below is the PHP source. This link goes to the below page as it appears in the Web browser.
<?php session_start(); // This sets $action to indicate which link the user clicked // (as with "forward" or "left"), or "start" if the user is just // starting out. if(isset($_GET["action"])) { $action = $_GET["action"]; } else { $action = "start"; } // $location and $direction specify which image to display. $location = 1; $facing = 1; // $enable_forward should be TRUE to indicate that the // "forward" text should be linked; similarly for // $enable_left, $enable_right, and $enable_back. $enable_forward = TRUE; $enable_left = TRUE; $enable_right = TRUE; $enable_back = FALSE; ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Room 587</title> <style> body { background: #000000; color: #FFFFFF; } a { color: #FFFFFF; text-decoration: none; } td { font-style: italic; text-align: center; color: #808080; } </style> </head> <body> <center> <h1>Room 587</h1> <?php $img_src = "http://ozark.hendrix.edu/~burch/cs/115/assn/07/" . "room-$location-$facing.jpg"; echo "<img src=\"$img_src\" width=\"320\" height=\"240\"" . " style=\"border: 2px solid #5C3900\" />"; ?> <table> <tr> <td></td> <td><?php if($enable_forward) { echo "<a href=\"room.php?action=forward\">forward</a>"; } else { echo "forward"; } ?></td> <td></td> </tr> <tr> <td><?php if($enable_left) { echo "<a href=\"room.php?action=left\">left</a>"; } else { echo "left"; } ?></td> <td><img src="http://ozark.hendrix.edu/~burch/cs/115/assn/07/compass.png" width="30" height="30" /></td> <td><?php if($enable_right) { echo "<a href=\"room.php?action=right\">right</a>"; } else { echo "right"; } ?></td> </tr> <tr> <td></td> <td><?php if($enable_back) { echo "<a href=\"room.php?action=back\">back</a>"; } else { echo "back"; } ?></td> <td></td></tr> </table> </center> </body> </html>