diff --git a/forms/demo.php b/forms/demo.php
index 3cc1e65..808ee79 100644
--- a/forms/demo.php
+++ b/forms/demo.php
@@ -28,7 +28,13 @@ $form_tpl = array(
 		</div>
 	</form>
 	<script>
-	$(\\"#captcha-ref\\").click(function() { $(\\"#captcha img\\").attr(\\"src\\", \\\'../inc/captcha.php?refresh=\\\' + new Date().getTime()); });
+	document.addEventListener(\\\'DOMContentLoaded\\\', (event) => {
+    const captchaRefreshBtn = document.getElementById(\\\'captcha-ref\\\');
+    const captchaImage = document.getElementById(\\\'captcha\\\').querySelector(\\\'img\\\');
+    captchaRefreshBtn.addEventListener(\\\'click\\\', () => {
+        captchaImage.src = \\\'../inc/captcha.php?refresh=\\\' + new Date().getTime();
+      });
+    });
 	</script>
 	[tag:if_form_invalid]
 	<script>
@@ -74,9 +80,14 @@ $form_tpl = array(
 		</div>
 	</form>
 	<script>
+	document.addEventListener(\\\'DOMContentLoaded\\\', (event) => {
+    const captchaRefreshBtn = document.getElementById(\\\'captcha-ref\\\');
+    const captchaImage = document.getElementById(\\\'captcha\\\').querySelector(\\\'img\\\');
+    captchaRefreshBtn.addEventListener(\\\'click\\\', () => {
+        captchaImage.src = \\\'../inc/captcha.php?refresh=\\\' + new Date().getTime();
+      });
+    });
 		$(\\\'#form_[tag:formalias]\\\').off();
-
-		$(\\"#captcha-ref\\").click(function() { $(\\"#captcha img\\").attr(\\"src\\", \\\'../inc/captcha.php?refresh=\\\' + new Date().getTime()); });
 		function form_popover (action) {
 			var _action = (action == undefined || !action) ? \\\'show\\\' : action;
 			$(\\\'#form_[tag:formalias] .form-control.invalid\\\').each(function(index, element) {
@@ -138,7 +149,13 @@ $form_tpl = array(
 		</div>
 	</form>
 	<script>
-	    $(\\"#captcha-ref\\").click(function() { $(\\"#captcha img\\").attr(\\"src\\", \\\'../inc/captcha.php?refresh=\\\' + new Date().getTime()); });
+	document.addEventListener(\\\'DOMContentLoaded\\\', (event) => {
+    const captchaRefreshBtn = document.getElementById(\\\'captcha-ref\\\');
+    const captchaImage = document.getElementById(\\\'captcha\\\').querySelector(\\\'img\\\');
+    captchaRefreshBtn.addEventListener(\\\'click\\\', () => {
+        captchaImage.src = \\\'../inc/captcha.php?refresh=\\\' + new Date().getTime();
+      });
+    });
 		$(\\\'#[tag:formalias] form\\\').on(\\\'submit\\\', function (e) {
 			e.preventDefault();
 			var form = $(this);