diff --git a/banners.php b/banners.php
new file mode 100644
index 00000000..c49f45ce
--- /dev/null
+++ b/banners.php
@@ -0,0 +1,31 @@
+<?php
+
+include 'inc/functions.php';
+
+header("Pragma-directive: no-cache");
+header("Cache-directive: no-cache");
+header("Cache-control: no-cache");
+header("Pragma: no-cache");
+header("Expires: 0");
+if (!isset($_GET['board'])) {
+	header("Location: static/8chan banner.png");
+	die();
+}
+$b = $_GET['board'];
+if (!preg_match('/^[a-z0-9]{1,10}$/', $b))
+	header("Location: static/8chan banner.png");
+
+$dir = 'static/banners/'.$b;
+
+if (is_dir($dir)) {
+	$banners = array_diff(scandir($dir), array('..', '.'));
+	$r = array_rand($banners);
+} else {
+	$banners = array();
+}
+
+if (!empty($banners)) {
+	header("Location: $dir/{$banners[$r]}");
+} else {
+	header("Location: static/8chan banner.png");
+}
diff --git a/templates/thread.html b/templates/thread.html
index a60b131e..69c79f3d 100644
--- a/templates/thread.html
+++ b/templates/thread.html
@@ -13,7 +13,7 @@
 <body>
 	{{ boardlist.top }}
 	{% if pm %}<div class="top_notice">You have <a href="?/PM/{{ pm.id }}">an unread PM</a>{% if pm.waiting > 0 %}, plus {{ pm.waiting }} more waiting{% endif %}.</div><hr />{% endif %}
-	{% if config.url_banner %}<img class="board_image" src="{{ config.url_banner }}" {% if config.banner_width or config.banner_height %}style="{% if config.banner_width %}width:{{ config.banner_width }}px{% endif %};{% if config.banner_width %}height:{{ config.banner_height }}px{% endif %}" {% endif %}alt="" />{% endif %}
+	{% if config.url_banner %}<img class="board_image" src="{{ config.url_banner }}?board={{ board.uri }}" {% if config.banner_width or config.banner_height %}style="{% if config.banner_width %}width:{{ config.banner_width }}px{% endif %};{% if config.banner_width %}height:{{ config.banner_height }}px{% endif %}" {% endif %}alt="" />{% endif %}
 	<header>
 		<h1>{{ board.url }} - {{ board.title|e }}</h1>
 		<div class="subtitle">
