TA - JS get page from URL

// take second to last char from the url
if(parseInt(window.location.href.substr(-2,1)) > 2) {
// Page number >2
googletag.defineSlot('/117607917/TA_G1_ATF_300V', [[300, 250],[300, 600]], 'div-gpt-ad-1460211993436-0').addService(googletag.pubads());
googletag.defineSlot('/117607917/TA_G1_BTF1_300V', [[300, 250],[300, 600]], 'div-gpt-ad-1460211993436-3').addService(googletag.pubads());

} else {
// Page number <= 2
googletag.defineSlot('/117607917/TA_G1_ATF_300V', [[300, 250]], 'div-gpt-ad-1460211993436-0').addService(googletag.pubads());
googletag.defineSlot('/117607917/TA_G1_BTF1_300V', [[300, 250]], 'div-gpt-ad-1460211993436-3').addService(googletag.pubads());

}