diff --git a/phpBB/styles/prosilver/template/viewforum_body.html b/phpBB/styles/prosilver/template/viewforum_body.html
index b9e222bff1..5ea1330aab 100644
--- a/phpBB/styles/prosilver/template/viewforum_body.html
+++ b/phpBB/styles/prosilver/template/viewforum_body.html
@@ -45,11 +45,11 @@
 
 	<!-- IF S_DISPLAY_SEARCHBOX -->
 		<div class="search-box">
-			<form method="post" id="forum-search" action="{S_SEARCHBOX_ACTION}">
+			<form method="get" id="forum-search" action="{S_SEARCHBOX_ACTION}">
 			<fieldset>
 				<input class="inputbox search tiny" type="text" name="keywords" id="search_keywords" size="20" value="{L_SEARCH_FORUM}" onclick="if (this.value == '{LA_SEARCH_FORUM}') this.value = '';" onblur="if (this.value == '') this.value = '{LA_SEARCH_FORUM}';" />
 				<input class="button2" type="submit" value="{L_SEARCH}" />
-				<input type="hidden" value="{FORUM_ID}" name="fid[]" />
+				{S_SEARCH_HIDDEN_FIELDS}
 			</fieldset>
 			</form>
 		</div>
diff --git a/phpBB/styles/prosilver/template/viewtopic_body.html b/phpBB/styles/prosilver/template/viewtopic_body.html
index 05c2b91a2e..5b9102e6d2 100644
--- a/phpBB/styles/prosilver/template/viewtopic_body.html
+++ b/phpBB/styles/prosilver/template/viewtopic_body.html
@@ -38,12 +38,11 @@
 
 	<!-- IF S_DISPLAY_SEARCHBOX -->
 		<div class="search-box">
-			<form method="post" id="topic-search" action="{S_SEARCHBOX_ACTION}">
+			<form method="get" id="topic-search" action="{S_SEARCHBOX_ACTION}">
 			<fieldset>
 				<input class="inputbox search tiny"  type="text" name="keywords" id="search_keywords" size="20" value="{L_SEARCH_TOPIC}" onclick="if(this.value=='{LA_SEARCH_TOPIC}')this.value='';" onblur="if(this.value=='')this.value='{LA_SEARCH_TOPIC}';" />
 				<input class="button2" type="submit" value="{L_SEARCH}" />
-				<input type="hidden" value="{TOPIC_ID}" name="t" />
-				<input type="hidden" value="msgonly" name="sf" />
+				{S_SEARCH_HIDDEN_FIELDS}
 			</fieldset>
 			</form>
 		</div>
diff --git a/phpBB/styles/subsilver2/template/searchbox.html b/phpBB/styles/subsilver2/template/searchbox.html
index cb0bb5ba73..09b87a15d8 100644
--- a/phpBB/styles/subsilver2/template/searchbox.html
+++ b/phpBB/styles/subsilver2/template/searchbox.html
@@ -1 +1 @@
-<form method="post" name="search" action="{S_SEARCHBOX_ACTION}"><span class="gensmall">{L_SEARCH_FOR}:</span> <input class="post" type="text" name="keywords" size="20" /> <input class="btnlite" type="submit" value="{L_GO}" /></form>
+<form method="get" name="search" action="{S_SEARCHBOX_ACTION}"><span class="gensmall">{L_SEARCH_FOR}:</span> <input class="post" type="text" name="keywords" size="20" /> <input class="btnlite" type="submit" value="{L_GO}" />{S_SEARCH_HIDDEN_FIELDS}</form>
diff --git a/phpBB/viewforum.php b/phpBB/viewforum.php
index c53150d89b..7b957482e8 100644
--- a/phpBB/viewforum.php
+++ b/phpBB/viewforum.php
@@ -272,6 +272,12 @@ $post_alt = ($forum_data['forum_status'] == ITEM_LOCKED) ? $user->lang['FORUM_LO
 // Display active topics?
 $s_display_active = ($forum_data['forum_type'] == FORUM_CAT && ($forum_data['forum_flags'] & FORUM_FLAG_ACTIVE_TOPICS)) ? true : false;
 
+$s_search_hidden_fields = array('fid' => $forum_id);
+if ($_SID)
+{
+	$s_search_hidden_fields['sid'] = $_SID;
+}
+
 $template->assign_vars(array(
 	'MODERATORS'	=> (!empty($moderators[$forum_id])) ? implode(', ', $moderators[$forum_id]) : '',
 
@@ -309,7 +315,8 @@ $template->assign_vars(array(
 	'S_WATCHING_FORUM'		=> $s_watching_forum['is_watching'],
 	'S_FORUM_ACTION'		=> append_sid("{$phpbb_root_path}viewforum.$phpEx", "f=$forum_id" . (($start == 0) ? '' : "&amp;start=$start")),
 	'S_DISPLAY_SEARCHBOX'	=> ($auth->acl_get('u_search') && $auth->acl_get('f_search', $forum_id) && $config['load_search']) ? true : false,
-	'S_SEARCHBOX_ACTION'	=> append_sid("{$phpbb_root_path}search.$phpEx", 'fid[]=' . $forum_id),
+	'S_SEARCHBOX_ACTION'	=> append_sid("{$phpbb_root_path}search.$phpEx"),
+	'S_SEARCH_HIDDEN_FIELDS'	=> build_hidden_fields($s_search_hidden_fields),
 	'S_SINGLE_MODERATOR'	=> (!empty($moderators[$forum_id]) && sizeof($moderators[$forum_id]) > 1) ? false : true,
 	'S_IS_LOCKED'			=> ($forum_data['forum_status'] == ITEM_LOCKED) ? true : false,
 	'S_VIEWFORUM'			=> true,
diff --git a/phpBB/viewtopic.php b/phpBB/viewtopic.php
index 53119e2ae7..d80659416f 100644
--- a/phpBB/viewtopic.php
+++ b/phpBB/viewtopic.php
@@ -546,6 +546,15 @@ $server_path = (!$view) ? $phpbb_root_path : generate_board_url() . '/';
 // Replace naughty words in title
 $topic_data['topic_title'] = censor_text($topic_data['topic_title']);
 
+$s_search_hidden_fields = array(
+	't' => $topic_id,
+	'sf' => 'msgonly',
+);
+if ($_SID)
+{
+	$s_search_hidden_fields['sid'] = $_SID;
+}
+
 // Send vars to template
 $template->assign_vars(array(
 	'FORUM_ID' 		=> $forum_id,
@@ -597,7 +606,8 @@ $template->assign_vars(array(
 
 	'S_VIEWTOPIC'			=> true,
 	'S_DISPLAY_SEARCHBOX'	=> ($auth->acl_get('u_search') && $auth->acl_get('f_search', $forum_id) && $config['load_search']) ? true : false,
-	'S_SEARCHBOX_ACTION'	=> append_sid("{$phpbb_root_path}search.$phpEx", 't=' . $topic_id),
+	'S_SEARCHBOX_ACTION'	=> append_sid("{$phpbb_root_path}search.$phpEx"),
+	'S_SEARCH_HIDDEN_FIELDS'	=> build_hidden_fields($s_search_hidden_fields),
 
 	'S_DISPLAY_POST_INFO'	=> ($topic_data['forum_type'] == FORUM_POST && ($auth->acl_get('f_post', $forum_id) || $user->data['user_id'] == ANONYMOUS)) ? true : false,
 	'S_DISPLAY_REPLY_INFO'	=> ($topic_data['forum_type'] == FORUM_POST && ($auth->acl_get('f_reply', $forum_id) || $user->data['user_id'] == ANONYMOUS)) ? true : false,