var change_menu_catalog_val = 49; function change_menu_catalog(id) { document.getElementById('menu_cat_id_'+change_menu_catalog_val).className = 'def'; change_menu_catalog_val = id; val = document.getElementById('menu_sub_'+id).innerHTML; document.getElementById('catalog_data').innerHTML = val; document.getElementById('menu_cat_id_'+id).className = 'sel'; }