Index: wp-admin/includes/default-list-tables.php
===================================================================
--- wp-admin/includes/default-list-tables.php	(revision 15897)
+++ wp-admin/includes/default-list-tables.php	(working copy)
@@ -4184,7 +4184,7 @@
 		$display_tabs = array();
 		foreach ( (array) $tabs as $action => $text ) {
 			$class = ( $action == $tab ) ? ' class="current"' : '';
-			$href = admin_url('theme-install.php?tab=' . $action);
+			$href = self_admin_url('theme-install.php?tab=' . $action);
 			$display_tabs[$action] = "<a href='$href'$class>$text</a>";
 		}
 
Index: wp-admin/includes/class-wp-upgrader.php
===================================================================
--- wp-admin/includes/class-wp-upgrader.php	(revision 15897)
+++ wp-admin/includes/class-wp-upgrader.php	(working copy)
@@ -1358,11 +1358,11 @@
 							);
 
 		if ( $this->type == 'web' )
-			$install_actions['themes_page'] = '<a href="' . admin_url('theme-install.php') . '" title="' . esc_attr__('Return to Theme Installer') . '" target="_parent">' . __('Return to Theme Installer') . '</a>';
+			$install_actions['themes_page'] = '<a href="' . self_admin_url('theme-install.php') . '" title="' . esc_attr__('Return to Theme Installer') . '" target="_parent">' . __('Return to Theme Installer') . '</a>';
 		else
-			$install_actions['themes_page'] = '<a href="' . admin_url('themes.php') . '" title="' . esc_attr__('Themes page') . '" target="_parent">' . __('Return to Themes page') . '</a>';
+			$install_actions['themes_page'] = '<a href="' . self_admin_url('themes.php') . '" title="' . esc_attr__('Themes page') . '" target="_parent">' . __('Return to Themes page') . '</a>';
 
-		if ( ! $this->result || is_wp_error($this->result) )
+		if ( ! $this->result || is_wp_error($this->result) || is_network_admin() )
 			unset( $install_actions['activate'], $install_actions['preview'] );
 
 		$install_actions = apply_filters('install_theme_complete_actions', $install_actions, $this->api, $stylesheet, $theme_info);
Index: wp-admin/includes/theme-install.php
===================================================================
--- wp-admin/includes/theme-install.php	(revision 15897)
+++ wp-admin/includes/theme-install.php	(working copy)
@@ -77,7 +77,7 @@
 	install_theme_search_form();
 ?>
 <h4><?php _e('Feature Filter') ?></h4>
-<form method="post" action="<?php echo admin_url( 'theme-install.php?tab=search' ); ?>">
+<form method="post" action="<?php echo self_admin_url( 'theme-install.php?tab=search' ); ?>">
 <p class="install-help"><?php _e('Find a theme based on specific features') ?></p>
 	<?php
 	$feature_list = get_theme_feature_list( );
@@ -116,7 +116,7 @@
 ?>
 <h4><?php _e('Install a theme in .zip format') ?></h4>
 <p class="install-help"><?php _e('If you have a theme in a .zip format, you may install it by uploading it here.') ?></p>
-<form method="post" enctype="multipart/form-data" action="<?php echo admin_url('update.php?action=upload-theme') ?>">
+<form method="post" enctype="multipart/form-data" action="<?php echo self_admin_url('update.php?action=upload-theme') ?>">
 	<?php wp_nonce_field( 'theme-upload') ?>
 	<input type="file" name="themezip" />
 	<input type="submit"
@@ -140,9 +140,10 @@
 	$preview_link = $theme->preview_url . '?TB_iframe=true&amp;width=600&amp;height=400';
 	if ( !is_array($actions) ) {
 		$actions = array();
-		$actions[] = '<a href="' . admin_url('theme-install.php?tab=theme-information&amp;theme=' . $theme->slug .
+		$actions[] = '<a href="' . self_admin_url('theme-install.php?tab=theme-information&amp;theme=' . $theme->slug .
 										'&amp;TB_iframe=true&amp;tbWidth=500&amp;tbHeight=385') . '" class="thickbox thickbox-preview onclick" title="' . esc_attr(sprintf(__('Install &#8220;%s&#8221;'), $name)) . '">' . __('Install') . '</a>';
-		$actions[] = '<a href="' . $preview_link . '" class="thickbox thickbox-preview onclick previewlink" title="' . esc_attr(sprintf(__('Preview &#8220;%s&#8221;'), $name)) . '">' . __('Preview') . '</a>';
+		if ( !is_network_admin() )
+			$actions[] = '<a href="' . $preview_link . '" class="thickbox thickbox-preview onclick previewlink" title="' . esc_attr(sprintf(__('Preview &#8220;%s&#8221;'), $name)) . '">' . __('Preview') . '</a>';
 		$actions = apply_filters('theme_install_action_links', $actions, $theme);
 	}
 
@@ -288,12 +289,12 @@
 default:
 case 'install':
 	if ( current_user_can('install_themes') ) :
-	$buttons .= '<a class="button-primary" id="install" href="' . wp_nonce_url(admin_url('update.php?action=install-theme&theme=' . $api->slug), 'install-theme_' . $api->slug) . '" target="_parent">' . __('Install Now') . '</a>';
+	$buttons .= '<a class="button-primary" id="install" href="' . wp_nonce_url(self_admin_url('update.php?action=install-theme&theme=' . $api->slug), 'install-theme_' . $api->slug) . '" target="_parent">' . __('Install Now') . '</a>';
 	endif;
 	break;
 case 'update_available':
 	if ( current_user_can('update_themes') ) :
-	$buttons .= '<a class="button-primary" id="install"	href="' . wp_nonce_url(admin_url('update.php?action=upgrade-theme&theme=' . $update_file), 'upgrade-theme_' . $update_file) . '" target="_parent">' . __('Install Update Now') . '</a>';
+	$buttons .= '<a class="button-primary" id="install"	href="' . wp_nonce_url(self_admin_url('update.php?action=upgrade-theme&theme=' . $update_file), 'upgrade-theme_' . $update_file) . '" target="_parent">' . __('Install Update Now') . '</a>';
 	endif;
 	break;
 case 'newer_installed':
Index: wp-admin/network/menu.php
===================================================================
--- wp-admin/network/menu.php	(revision 15897)
+++ wp-admin/network/menu.php	(working copy)
@@ -19,7 +19,11 @@
 $submenu['sites.php'][10]  = array( __('Add New'), 'manage_sites', 'site-new.php' );
 
 $menu[10] = array(__('Users'), 'manage_network_users', 'users.php', '', 'menu-top menu-icon-users', 'menu-users', 'div');
+
 $menu[15] = array(__('Themes'), 'manage_network_themes', 'themes.php', '', 'menu-top menu-icon-appearance', 'menu-appearance', 'div');
+$submenu['themes.php'][5]  = array( __('Themes'), 'manage_network_themes', 'themes.php' );
+$submenu['themes.php'][10] = array( _x('Add New', 'theme'), 'manage_network_themes', 'theme-install.php' );
+$submenu['themes.php'][15] = array( _x('Editor', 'theme editor'), 'edit_themes', 'theme-editor.php' );
 
 $plugin_update_count = $theme_update_count = $wordpress_update_count = 0;
 $update_plugins = get_site_transient( 'update_plugins' ); 
@@ -59,9 +63,6 @@
 
 $menu[99] = array( '', 'read', 'separator-last', '', 'wp-menu-separator-last' );
 
-$submenu['themes.php'][5]  = array( __('Themes'), 'manage_network_themes', 'themes.php' );
-$submenu['themes.php'][15] = array( _x('Editor', 'plugin editor'), 'edit_themes', 'theme-editor.php' );
-
 require_once(ABSPATH . 'wp-admin/includes/menu.php');
 
 ?>
\ No newline at end of file
Index: wp-admin/network/theme-install.php
===================================================================
--- wp-admin/network/theme-install.php	(revision 0)
+++ wp-admin/network/theme-install.php	(revision 0)
@@ -0,0 +1,12 @@
+<?php
+/**
+ * Install theme network administration panel.
+ *
+ * @package WordPress
+ * @subpackage Administration
+ * @since 3.1.0
+ */
+
+require_once( './admin.php' );
+
+require( '../theme-install.php' );
\ No newline at end of file
Index: wp-admin/theme-install.php
===================================================================
--- wp-admin/theme-install.php	(revision 15897)
+++ wp-admin/theme-install.php	(working copy)
@@ -15,7 +15,8 @@
 
 $title = __('Install Themes');
 $parent_file = 'themes.php';
-$submenu_file = 'themes.php';
+if ( !is_network_admin() )
+	$submenu_file = 'themes.php';
 
 wp_enqueue_style( 'theme-install' );
 wp_enqueue_script( 'theme-install' );
@@ -35,17 +36,25 @@
 $help .= '<p>' . __('<a href="http://wordpress.org/support/" target="_blank">Support Forums</a>') . '</p>';
 add_contextual_help($current_screen, $help);
 
-include('./admin-header.php');
+include(ABSPATH . 'wp-admin/admin-header.php');
 ?>
 <div class="wrap">
-<?php screen_icon(); ?>
+<?php
+screen_icon(); 
+
+if ( is_network_admin() ) : ?>
+<h2><?php echo esc_html( $title ); ?></h2>
+<?php else : ?>
 <h2><a href="themes.php" class="nav-tab"><?php echo esc_html_x('Manage Themes', 'theme'); ?></a><a href="theme-install.php" class="nav-tab nav-tab-active"><?php echo esc_html( $title ); ?></a></h2>
 
-<?php $wp_list_table->views(); ?>
+<?php 
+endif;
 
+$wp_list_table->views(); ?>
+
 <br class="clear" />
 <?php do_action('install_themes_' . $tab, $paged); ?>
 </div>
 <?php
-include('./admin-footer.php');
+include(ABSPATH . 'wp-admin/admin-footer.php');