diff --git a/inc/config.php b/inc/config.php
index a76d00de..1444c61b 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -1786,7 +1786,7 @@
 	$config['error']['securimage']=array(
 		'missing'=>'The captcha field was missing. Please try again',
 		'empty'=>'Please fill out the captcha',
-		'bad'=>'Incorrect captcha',
+		'bad'=>'Incorrect or expired captcha',
 	);
 
     // Meta keywords. It's probably best to include these in per-board configurations.
diff --git a/js/ajax.js b/js/ajax.js
index c312c130..01de3b08 100644
--- a/js/ajax.js
+++ b/js/ajax.js
@@ -56,6 +56,7 @@ $(window).ready(function() {
                     return xhr;
                 },
                 success: function(post_response) {
+                    reloadCaptcha(); // For securimage captcha. TODO doesn't always need reloading
                     if (post_response.error) {
                         if (post_response.banned) {
                             // You are banned. Must post the form normally so the user can see the ban message.
diff --git a/templates/main.js b/templates/main.js
index af665987..024b748e 100755
--- a/templates/main.js
+++ b/templates/main.js
@@ -286,6 +286,17 @@ function dopost(form) {
 	return form.elements['body'].value != "" || (form.elements['file'] && form.elements['file'].value != "") || (form.elements.file_url && form.elements['file_url'].value != "");
 }
 
+function reloadCaptcha() {
+	// Reload captcha images (date reduces chance of caching)
+	// If no securimage captcha is enabled, no elements will be found
+	captchaImgs = document.querySelectorAll('[id=captcha-img]');
+	for (var i = 0; i < captchaImgs.length; ++i)
+		captchaImgs[i].src = "/captcha.php?"+Date.now();
+	captchas = document.querySelectorAll('[id=captcha]');
+	for (var i = 0; i < captchas.length; ++i)
+		captchas[i].value = "";
+}
+
 function citeReply(id, with_link) {
 	var textarea = document.getElementById('body');
 
diff --git a/templates/post_form.html b/templates/post_form.html
index 63ace217..e8c14485 100644
--- a/templates/post_form.html
+++ b/templates/post_form.html
@@ -102,8 +102,8 @@
 				Captcha
 			</th>
 			<td>
-				<img src="{{ config.root }}/captcha.php"><br />
-				<input type="text" name="captcha" size="25" maxlength="10" autocomplete="off">
+		        <img name="captcha-img" id="captcha-img" src="/captcha.php" onClick="this.src='/captcha.php?'+Date.now();document.getElementById('captcha').value = '';"><br />
+				<input type="text" name="captcha" id="captcha" size="25" maxlength="10" autocomplete="off">
 			</td>
 		</tr>
 		{% endif %}