diff --git a/bookdetail.php b/bookdetail.php
index 4a631ba..27343b5 100644
--- a/bookdetail.php
+++ b/bookdetail.php
@@ -33,7 +33,9 @@ $book->getLinkArray ();
             <?php
                 if ($book->hasCover) {
             ?>
-            <a href="fetch.php?id=<?php echo $book->id ?>"><img src="fetch.php?id=<?php echo $book->id ?>&amp;height=150" alt="<?php echo localize("i18n.coversection") ?>" /></a>
+            <a href="<?php echo Data::getLink ($book, "jpg", "image/jpeg", Link::OPDS_IMAGE_TYPE, "cover.jpg", NULL)->hrefXhtml () ?>">
+              <img src="<?php echo Data::getLink ($book, "jpg", "image/jpeg", Link::OPDS_THUMBNAIL_TYPE, "cover.jpg", NULL, NULL, 150)->hrefXhtml () ?>" alt="<?php echo localize("i18n.coversection") ?>" />
+            </a>
             <?php
                 }
             ?>
diff --git a/data.php b/data.php
index 1ed427f..f929caf 100644
--- a/data.php
+++ b/data.php
@@ -107,7 +107,7 @@ class Data extends Base {
         }
     }
     
-    public static function getLink ($book, $type, $mime, $rel, $filename, $idData, $title = NULL)
+    public static function getLink ($book, $type, $mime, $rel, $filename, $idData, $title = NULL, $height = NULL)
     {
         global $config;
         
@@ -120,13 +120,14 @@ class Data extends Base {
         {
             if ($type != "jpg") $urlParam = addURLParameter($urlParam, "type", $type);
             if ($rel == Link::OPDS_THUMBNAIL_TYPE) {
-                $height = "50";
-                if (preg_match ('/feed.php/', $_SERVER["SCRIPT_NAME"])) {
-                    $height = $config['cops_opds_thumbnail_height'];
-                }
-                else
-                {
-                    $height = $config['cops_html_thumbnail_height'];
+                if (is_null ($height)) {
+                    if (preg_match ('/feed.php/', $_SERVER["SCRIPT_NAME"])) {
+                        $height = $config['cops_opds_thumbnail_height'];
+                    }
+                    else
+                    {
+                        $height = $config['cops_html_thumbnail_height'];
+                    }
                 }
                 $urlParam = addURLParameter($urlParam, "height", $height);
             }