added a note to myself to delete a line later

preferences.php

@@ -6,6 +6,14 @@ if (!empty($_POST['useremail'])) {
 	//this section contains code to update the users e-mail address, maybe via an include?
 	include_once ('includes/update-email.php');
 }
+
+if (!empty($_POST['oldpass'])) {
+	echo 'if the oldpass is set, execute code here (this line will go away from preferences.php!)<br />';
+	include_once ('includes/update-password.php');
+} else {
+	echo 'if post oldpass is NOT set, then this else statement can go away.<br />';
+}
+
 echo '<h3>Change e-mail or password</h3>';
 
 // listing all session variables currently set for debugging purposes
@@ -14,9 +22,33 @@ var_dump($_SESSION);
 echo '</pre><br />';
 // delete the above 3 lines when done
 
+// update e-mail address form
 echo '<form action="preferences.php" method="post"><table border="1">';
 echo '<caption>Update e-mail address</caption>';
 echo '<tr><td><input type="text" name="useremail" value="' . $_SESSION['usermail'] . '"></td><td><input type="submit" value="Update e-mail"></td></tr>';
-echo '</table></form><br />';
+echo '</table></form><br /><br />';
+
+// update password form
+echo <<<UPDPASS
+<form action="preferences.php" method="post"><table border="1">
+<tr><th>Old Password</th><tr>
+<tr><td><input type="password" name="oldpass" required></td></tr>
+<tr><th>New password</th></tr>
+<tr><td><input type="password" required="required" name="userpass1" id="up1"></td></tr>
+<tr><th>Verify password</th></tr>
+<tr><td><input type="password" required="required" name="userpass2" id="up2"></td></tr>
+</table><script type="text/javascript">
+    function Validate() {
+        var userpass1 = document.getElementById("up1").value;
+        var userpass2 = document.getElementById("up2").value;
+        if (userpass1 != userpass2) {
+            alert("Passwords do not match.");
+            return false;
+        }
+        return true;
+    }
+</script>
+<input type="submit" name="submission" value="Update password" onclick="return Validate()" id="btnSubmit">
+UPDPASS;
 include_once ('footer.php');
 ?>