DFP Wallpaper Ad Code

DFP Wallpaper Ad

<script>
var WallpaperAd = WallpaperAd || {};

/*-------------------------------------------------------------------------------------------------------*/
/* Two values are needed for Wallpaper Ads: */
/*  1.) destinationURL (where you want visitors to go when they click the wallpaper) */
/*      - NOTE: Click-throughs to this URL will automatically be tracked in DFP */
/*  2.) backgroundURL (URL of wallpaper background image) */
/*      - NOTE: Make sure to change the URL to start with 
http://assets.dmagazine.com so that it is served via CloudFlare CDN (this makes pages and images load faster) */
/*-------------------------------------------------------------------------------------------------------*/
/* IMPORTANT: Change only the two variable values below */
/*-------------------------------------------------------------------------------------------------------*/

    WallpaperAd.destinationURL = "http://www.arkansas.com";
    WallpaperAd.backgroundURL = "http://assets.dmagazine.com/media/1589280/arkansas-bg2.jpg";

/*-------------------------------------------------------------------------------------------------------*/
/* DO NOT MODIFY CODE BELOW */
/*-------------------------------------------------------------------------------------------------------*/

WallpaperAd.clickThroughURL = "%%CLICK_URL_UNESC%%" + WallpaperAd.destinationURL;

(function() {
  var d=document,
  h=d.getElementsByTagName('head')[0],
  s=d.createElement('script');
  s.type='text/javascript';
  s.async=true;
  s.src='//assets.dmagazine.com/content/assets/scripts/footer/dmag.wallpaper-ad.js';
  h.appendChild(s);
}());
</script>

I'm currently testing this wallpaper out and it works well. The only issue I have is whenever I resize my browser, the left side of the image never moves or expands. So depending on your screen resolution, you'll see a different image on the right side but the left side will always remain static. Is there a way to make changes to the script so I the skinner on the left and right moves/expands together at the same time like the below example?
http://www.cinema.com.my/default_skinnermock_v3.aspx