{* $http_vars: association array of parameters to send to next page $i: general $ids: ids of all items to display $item_htmls: information of items(association array). array( 'selected' => (1:checked 0:not checked), 'html' => (summary of item in HTML), 'item_id' => id of item ) $item_per_page: number of items displaying a page $submit_url URL to go when submit $maxpage $order_by_select $page $page_no_label $search_var[]: array of parameter names that send in submit. $selected $search_tabs tabname of [item] [metadata] and [file] array('label'=>tab label,'count'=>nuber of result in the tab) $search_tab $url_for_get: url for displaying this page directly $export_enabled: when items in this page can export, this parameter is defined. *}>