--- roundcubemail-0.2.1/program/include/rcmail.php      2009-03-02 19:34:18.000000000 +0200
+++ roundcubemail-dev/program/include/rcmail.php        2009-03-10 18:56:07.000000000 +0200
@@ -290,7 +290,7 @@
     if (!($this->output instanceof rcube_template))
       $this->output = new rcube_template($this->task, $framed);

-    foreach (array('flag_for_deletion','read_when_deleted') as $js_config_var) {
+    foreach (array('flag_for_deletion','read_when_deleted','preview_pane_mark_read') as $js_config_var) {
       $this->output->set_env($js_config_var, $this->config->get($js_config_var));
     }

--- roundcubemail-0.2.1/program/js/app.js       2009-02-27 13:06:29.000000000 +0200
+++ roundcubemail-dev/program/js/app.js 2009-03-10 19:00:20.000000000 +0200
@@ -1406,7 +1406,7 @@
       this.set_busy(true, 'loading');
       target.location.href = this.env.comm_path+url;
       // mark as read and change mbox unread counter
-      if (action == 'preview' && this.message_list && this.message_list.rows[id] && this.message_list.rows[id].unread)
+      if (action == 'preview' && this.message_list && this.message_list.rows[id] && this.message_list.rows[id].unread && this.env.preview_pane_mark_read)
         {
         this.set_message(id, 'unread', false);
        if (this.env.unread_counts[this.env.mailbox])
@@ -3714,6 +3714,13 @@
       addrbook_show_images.disabled = !checkbox.checked;
     }

+  this.toggle_preview_pane = function(checkbox)
+    {
+    var preview_pane_mark_read;
+    if(preview_pane_mark_read = document.getElementById("rcmfd_preview_pane_mark_read"))
+      preview_pane_mark_read.disabled = !checkbox.checked;
+       }
+
   // display fetched raw headers
   this.set_headers = function(content)
     {
--- roundcubemail-0.2.1/program/localization/en_US/labels.inc   2009-01-17 03:55:39.000000000 +0200
+++ roundcubemail-dev/program/localization/en_US/labels.inc     2009-03-10 19:03:08.000000000 +0200
@@ -268,6 +268,7 @@
 $labels['htmleditor'] = 'Compose HTML messages';
 $labels['htmlsignature'] = 'HTML signature';
 $labels['previewpane'] = 'Show preview pane';
+$labels['previewpanemarkread']  = 'Mark previewed messages as read';
 $labels['skin'] = 'Interface skin';
 $labels['logoutclear'] = 'Clear Trash on logout';
 $labels['logoutcompact'] = 'Compact Inbox on logout';
--- roundcubemail-0.2.1/program/localization/et_EE/labels.inc   2009-01-17 03:55:39.000000000 +0200
+++ roundcubemail-dev/program/localization/et_EE/labels.inc     2009-03-10 19:13:48.000000000 +0200
@@ -213,6 +213,7 @@
 $labels['htmleditor'] = 'Kasuta HTML redaktorit';
 $labels['htmlsignature'] = 'HTML allkiri';
 $labels['previewpane'] = 'Näita eelvaate akent';
+$labels['previewpanemarkread']  = 'Märgi eelvaatamisel kirjad loetuks';
 $labels['skin'] = 'Kliendi välimus';
 $labels['logoutclear'] = 'Tühjenda väljumisel prügikast';
 $labels['logoutcompact'] = 'Tihenda väljumisel sissetulevate kaust';
--- roundcubemail-0.2.1/program/steps/mail/show.inc     2009-02-18 21:15:36.000000000 +0200
+++ roundcubemail-dev/program/steps/mail/show.inc       2009-03-10 19:04:50.000000000 +0200
@@ -135,7 +135,7 @@
     }

   // mark message as read
-  if (!$MESSAGE->headers->seen)
+  if (!$MESSAGE->headers->seen && !($RCMAIL->action == 'preview' && !$CONFIG['preview_pane_mark_read']))
     $IMAP->set_flag($MESSAGE->uid, 'SEEN');
   }

--- roundcubemail-0.2.1/program/steps/settings/func.inc 2008-12-31 19:52:55.000000000 +0200
+++ roundcubemail-dev/program/steps/settings/func.inc   2009-03-10 19:07:40.000000000 +0200
@@ -178,12 +178,21 @@
     // show config parameter for preview pane
     if (!isset($no_override['preview_pane'])) {
       $field_id = 'rcmfd_preview';
-      $input_preview = new html_checkbox(array('name' => '_preview_pane', 'id' => $field_id, 'value' => 1));
+         $input_preview = new html_checkbox(array('name' => '_preview_pane', 'id' => $field_id, 'value' => 1,'onchange' => JS_OBJECT_NAME.'.toggle_preview_pane(this)'));

       $table->add('title', html::label($field_id, Q(rcube_label('previewpane'))));
       $table->add(null, $input_preview->show($config['preview_pane']?1:0));
     }

+    // show config parameter for preview pane auto mark as read
+    if (!isset($no_override['preview_pane_mark_read'])) {
+      $field_id = 'rcmfd_preview_pane_mark_read';
+      $input_preview = new html_checkbox(array('name' => '_preview_pane_mark_read', 'id' => $field_id, 'value' => 1, 'disabled' => $config['preview_pane']?0:1));
+
+      $table->add('title', html::label($field_id, Q(rcube_label('previewpanemarkread'))));
+      $table->add(null, $input_preview->show($config['preview_pane_mark_read']?1:0));
+    }
+
     if (!isset($no_override['mdn_requests'])) {
       $field_id = 'rcmfd_mdn_requests';
       $select_mdn_requests = new html_select(array('name' => '_mdn_requests', 'id' => $field_id));
--- roundcubemail-0.2.1/program/steps/settings/save_prefs.inc   2008-12-04 12:21:34.000000000 +0200
+++ roundcubemail-dev/program/steps/settings/save_prefs.inc     2009-03-10 19:08:22.000000000 +0200
@@ -29,6 +29,7 @@
   'htmleditor'   => isset($_POST['_htmleditor']) ? TRUE : FALSE,
   'inline_images'   => isset($_POST['_inline_images']) ? TRUE : FALSE,
   'preview_pane' => isset($_POST['_preview_pane']) ? TRUE : FALSE,
+  'preview_pane_mark_read' => isset($_POST['_preview_pane_mark_read']) ? TRUE : FALSE,
   'focus_on_new_message' => isset($_POST['_focus_on_new_message']) ? TRUE : FALSE,
   'read_when_deleted' => isset($_POST['_read_when_deleted']) ? TRUE : FALSE,
   'skip_deleted' => isset($_POST['_skip_deleted']) ? TRUE : FALSE,