<script async src=”https://www.googletagservices.com/tag/js/gpt.js”></script&gt;
<script>
var googletag = googletag || {};
googletag.cmd = googletag.cmd || [];
</script>
<script>
// GPT slots
var gptAdSlots = [];
googletag.cmd.push(function() {

// Define a size mapping object. The first parameter to addSize is
// a viewport size, while the second is a list of allowed ad sizes.
// This mapping will only display ads when user is on desktop sized viewport

var mapping1 = googletag.sizeMapping().
addSize([1920, 1080], [728, 90]).
addSize([980, 690], [[728, 90], [468, 60]]).
addSize([640, 480], [[468, 60], [320, 50]]).
addSize([320, 240], [320, 50]).
build();

var mapping2 = googletag.sizeMapping().
addSize([1024, 768], [[728, 90], [300, 600], [300, 250]]).
addSize([980, 690], [[728, 90], [300, 600], [300, 250]]).
addSize([640, 480], [[468, 60], [300, 600], [300, 250]]).
addSize([320, 240], [[300, 600], [300, 250], [320, 50]]).
build();

gptAdSlots[0] = googletag.defineSlot(‘/93785620/fxxxxx_left_mpu’, [300, 250], ‘div-gpt-ad-1496335639901-0’).
setCollapseEmptyDiv(true).
addService(googletag.pubads());

gptAdSlots[1] = googletag.defineSlot(‘/93785620/fxxxxx_top_leaderboard’, [[728, 90], [468, 60], [320, 50]], ‘div-gpt-ad-1496335639901-1’).

defineSizeMapping(mapping1).
setCollapseEmptyDiv(true).
addService(googletag.pubads());

gptAdSlots[2] = googletag.defineSlot(‘/93785620/xxxxx_right_mpu’, [300, 250], ‘div-gpt-ad-1496335639901-2’).

setCollapseEmptyDiv(true).
addService(googletag.pubads());

// Start ad fetching
googletag.enableServices();
});

</script>