Index: class.t3lib_befunc.php
===================================================================
--- class.t3lib_befunc.php	(revision 51)
+++ class.t3lib_befunc.php	(working copy)
@@ -2615,15 +2615,6 @@
 			$viewScriptPreviewEnabled  = '/' . TYPO3_mainDir . 'mod/user/ws/wsol_preview.php?id=';
 			$viewScriptPreviewDisabled = '/index.php?id=';
 
-				// check alternate Domains
-			if ($rootLine)  {
-				$parts = parse_url(t3lib_div::getIndpEnv('TYPO3_SITE_URL'));
-				if (t3lib_BEfunc::getDomainStartPage($parts['host'],$parts['path']))    {
-					$preUrl_temp = t3lib_BEfunc::firstDomainRecord($rootLine);
-				}
-			}
-			$preUrl = $preUrl_temp ? (t3lib_div::getIndpEnv('TYPO3_SSL') ? 'https://' : 'http://').$preUrl_temp : $backPath.'..';
-
 				// Look if a fixed preview language should be added:
 			$viewLanguageOrder = $GLOBALS['BE_USER']->getTSConfigVal('options.view.languageOrder');
 			if (strlen($viewLanguageOrder))	{
@@ -2653,8 +2644,9 @@
 				$addGetVars.= $suffix;
 			}
 
-			$urlPreviewEnabled  = $preUrl . $viewScriptPreviewEnabled . $id . $addGetVars . $anchor;
-			$urlPreviewDisabled = $preUrl . $viewScriptPreviewDisabled . $id . $addGetVars . $anchor;
+			$viewDomain = t3lib_BEfunc::getViewDomain($id, $rootLine);
+			$urlPreviewEnabled  = $viewDomain . $viewScriptPreviewEnabled . $id . $addGetVars . $anchor;
+			$urlPreviewDisabled = $viewDomain . $viewScriptPreviewDisabled . $id . $addGetVars . $anchor;
 		}
 
 		return "previewWin=window.open(top.WorkspaceFrontendPreviewEnabled?'" .
@@ -2662,6 +2654,36 @@
 			"','newTYPO3frontendWindow');" . ( $switchFocus ? 'previewWin.focus();' : '');
 	}
 
+ 	/**
+	 * Builds the frontend view domain for a given page ID with a given root
+	 * line.
+	 *
+	 * @param integer $pageId the page ID to use, must be > 0
+	 * @param array $rootLine the root line structure to use
+	 *
+	 * @return string the full domain including the protocol http:// or https://
+	 *
+	 * @author Michael Klapper <michael.klapper@aoemedia.de>
+	 */
+	public static function getViewDomain($pageId, $rootLine = null) {
+		$domain = t3lib_div::getIndpEnv('TYPO3_SITE_URL');
+
+		if (!is_array($rootLine)) {
+			$rootLine = t3lib_BEfunc::BEgetRootLine($pageId);
+		}
+
+		// checks alternate Domains
+		if (count($rootLine) > 0) {
+			$urlParts = parse_url($domain);
+			if (t3lib_BEfunc::getDomainStartPage($urlParts['host'], $urlParts['path'])) {
+				$protocol = t3lib_div::getIndpEnv('TYPO3_SSL') ? 'https://' : 'http://';
+				$domain = $protocol . t3lib_BEfunc::firstDomainRecord($rootLine);
+			}
+		}
+
+		return $domain;
+	}	
+	
 	/**
 	 * Returns the merged User/Page TSconfig for page id, $id.
 	 * Please read details about module programming elsewhere!