diff --git a/base.php b/base.php
index 0aa1e0a..e7e8123 100644
--- a/base.php
+++ b/base.php
@@ -26,6 +26,8 @@ require("include.mysql.php");
 require("include.session.php");
 require("include.csrf.php");
 
+require("include.lib.php");
+
 require("class.templater.php");
 require("class.localizer.php");
 
diff --git a/include.lib.php b/include.lib.php
new file mode 100644
index 0000000..f6d9eb5
--- /dev/null
+++ b/include.lib.php
@@ -0,0 +1,99 @@
+<?php
+/*
+ * CPHP is more free software. It is licensed under the WTFPL, which
+ * allows you to do pretty much anything with it, without having to
+ * ask permission. Commercial use is allowed, and no attribution is
+ * required. We do politely request that you share your modifications
+ * to benefit other developers, but you are under no enforced
+ * obligation to do so :)
+ * 
+ * Please read the accompanying LICENSE document for the full WTFPL
+ * licensing text.
+ */
+
+if($_CPHP !== true) { die(); }
+
+if(!isset($cphp_config->libraries))
+{
+	/* No library configuration has been specified. We don't need to
+	 * execute the rest of this file. */
+	return;
+}
+
+/* Some libraries want to have a cache directory. Instead of storing all
+ * this stuff in the document root, we'll put it into /tmp (or any other
+ * config-specified directory). We should probably make sure the needed
+ * directories exist, though... */
+
+$tmp_dir = (isset($cphp_config->tmp_dir)) ? $cphp_config->tmp_dir : "/tmp";
+
+if(!file_exists("{$tmp_dir}/cphp"))
+{
+	mkdir("{$tmp_dir}/cphp", 0700);
+}
+
+if(!file_exists("{$tmp_dir}/cphp/cache"))
+{
+	mkdir("{$tmp_dir}/cphp/cache", 0700);
+}
+
+/* We'll set up HTMLPurifier here if so desired. */
+if(isset($cphp_config->libraries->htmlpurifier))
+{
+	if(!is_dir("{$tmp_dir}/cphp/cache/htmlpurifier"))
+	{
+		mkdir("{$tmp_dir}/cphp/cache/htmlpurifier", 0700);
+	}
+	
+	$library_config = $cphp_config->libraries->htmlpurifier;
+	$library_path = (isset($library_config->path)) ? $library_config->path : "lib/htmlpurifier/HTMLPurifier.auto.php";
+	
+	require_once($library_path);
+	
+	$purifier_config = HTMLPurifier_Config::createDefault();
+	
+	if(isset($library_config->doctype))
+	{
+		$purifier_config->set("HTML.Doctype", $library_config->doctype);
+	}
+
+	if(isset($library_config->encoding))
+	{
+		$purifier_config->set("Core.Encoding", $library_config->encoding);
+	}
+	
+	$purifier_config->set("Cache.SerializerPath", "{$tmp_dir}/cphp/cache/htmlpurifier");
+	
+	$cphp_purifier = new HTMLPurifier($purifier_config);
+	$cphp_hash_purifier_config = md5(serialize($purifier_config));
+
+	function purify_html($input, $cache_duration = 3600, $config = null)
+	{
+		if(isset($config))
+		{
+			$config->set("Cache.SerializerPath", "{$tmp_dir}/cphp/cache/htmlpurifier");
+			$cphp_purifier = new HTMLPurifier($config);
+			$hash_config = md5(serialize($config));
+		}
+		else
+		{
+			global $cphp_purifier;
+			global $cphp_hash_purifier_config;
+			$hash_config = $cphp_hash_purifier_config;
+		}
+		
+		$hash_input = md5($input) . md5($input . "x");
+		$memcache_key = "purify_{$hash_config}_{$hash_input}";
+		
+		if($result = mc_get($memcache_key))
+		{
+			return $result;
+		}
+		else
+		{
+			$result = $cphp_purifier->purify($input);
+			mc_set($memcache_key, $result, $cache_duration);
+			return $result;
+		}
+	}
+}