function jumpto(){var page=prompt(jump_page,on_page);if(page!==null&&!isNaN(page)&&page==Math.floor(page)&&page>0){if(page>max_page)return;if (base_url.indexOf('?') == -1){document.location.href=base_url+'?page='+page;}else{var url = base_url.replace(/&/g, '&');url = base_url.replace(/{page}/g, page);document.location.href =url;}}}