diff --git a/themes/darkblue_orange/css/theme_right.css.php b/themes/darkblue_orange/css/theme_right.css.php
index c337ceec9..2a78ca87a 100644
--- a/themes/darkblue_orange/css/theme_right.css.php
+++ b/themes/darkblue_orange/css/theme_right.css.php
@@ -666,8 +666,8 @@ ul#topmenu li {
     background-color:   <?php echo $GLOBALS['cfg']['BgOne']; ?>;
     border:             1pt solid <?php echo $GLOBALS['cfg']['BgTwo']; ?>;
     border-bottom:      0;
-    border-top-left-radius: 0.4em;
-    border-top-right-radius: 0.4em;
+    -moz-border-radius: 0.4em 0.4em 0 0;
+    border-radius:      0.4em 0.4em 0 0;
 }
 
 /* enabled hover/active tabs */
diff --git a/themes/original/css/theme_right.css.php b/themes/original/css/theme_right.css.php
index 9a7434d95..acb2c7d57 100644
--- a/themes/original/css/theme_right.css.php
+++ b/themes/original/css/theme_right.css.php
@@ -641,8 +641,8 @@ ul#topmenu li {
     background-color:   <?php echo $GLOBALS['cfg']['BgOne']; ?>;
     border:             1pt solid <?php echo $GLOBALS['cfg']['BgTwo']; ?>;
     border-bottom:      0;
-    border-top-left-radius: 0.4em;
-    border-top-right-radius: 0.4em;
+    -moz-border-radius: 0.4em 0.4em 0 0;
+    border-radius:      0.4em 0.4em 0 0;
 }
 
 /* enabled hover/active tabs */