Index: wp-admin/includes/nav-menu.php
===================================================================
--- wp-admin/includes/nav-menu.php	(revision 17974)
+++ wp-admin/includes/nav-menu.php	(working copy)
@@ -137,13 +137,10 @@
 						<input type="text" id="edit-menu-item-attr-title-<?php echo $item_id; ?>" class="widefat edit-menu-item-attr-title" name="menu-item-attr-title[<?php echo $item_id; ?>]" value="<?php echo esc_attr( $item->post_excerpt ); ?>" />
 					</label>
 				</p>
-				<p class="field-link-target description description-thin">
+				<p class="field-link-target description">
 					<label for="edit-menu-item-target-<?php echo $item_id; ?>">
-						<?php _e( 'Link Target' ); ?><br />
-						<select id="edit-menu-item-target-<?php echo $item_id; ?>" class="widefat edit-menu-item-target" name="menu-item-target[<?php echo $item_id; ?>]">
-							<option value="" <?php selected( $item->target, ''); ?>><?php _e('Same window or tab'); ?></option>
-							<option value="_blank" <?php selected( $item->target, '_blank'); ?>><?php _e('New window or tab'); ?></option>
-						</select>
+						<input type="checkbox" id="edit-menu-item-target-<?php echo $item_id; ?>" value="_blank" name="menu-item-target[<?php echo $item_id; ?>]"<?php checked( $item->target, '_blank' ); ?> />
+						<?php _e( 'Open link in a new window/tab' ); ?>
 					</label>
 				</p>
 				<p class="field-css-classes description description-thin">