Index: t3lib/class.t3lib_pagerenderer.php
===================================================================
--- t3lib/class.t3lib_pagerenderer.php	(revision 8049)
+++ t3lib/class.t3lib_pagerenderer.php	(working copy)
@@ -591,11 +591,34 @@
 	/**
 	 * Adds meta data
 	 *
-	 * @param string $meta	meta data (complete metatag)
+	 * @param string $name	name attribute of meta tag
+	 * @param string $content	content attribute of meta tag
+	 * @param string $additionalParameter	key/value pairs of additional attributes
 	 * @return void
 	 */
-	public function addMetaTag($meta) {
-		if (!in_array($meta, $this->metaTags)) {
+	public function addMetaTag($name, $content = '', $additionalParameter = array()) {
+		$additionalAttributes = '';
+			// backward compatibility, check for complete meta tag
+		if (t3lib_div::isFirstPartOfStr($name, '<')) {
+			$meta = $name;
+		} else {
+			$name = 'name="' . htmlspecialchars($name) . '" ';
+			if (count($additionalParameter) > 0) {
+				foreach ($additionalParameter as $attributeName => $attributeValue) {
+					if ($attributeName === 'http-equiv') {
+							// http-equiv replace the name attribute
+						$name = 'http-equiv="' . htmlspecialchars($attributeValue) . '" ';
+					} else {
+						$additionalAttributes .= htmlspecialchars($attributeName) . '="' . htmlspecialchars($attributeValue) . '" ';
+					}
+				}
+			}
+			$meta = '<meta ' . $name .
+					'content="' . htmlspecialchars($content) . '" ' .
+					$additionalAttributes . '/>';
+		}
+
+		if (t3lib_div::inArray($this->metaTags, $meta)) {
 			$this->metaTags[] = $meta;
 		}
 	}