Coding help required, unable to display banner on iphone

[Steve Bullman]

Hi, I wonder if someone may be able to help.  I have this banner code displayed in global template.

<div class="wm-header-ad">
          <script type='text/javascript'><!--//<![CDATA[
   var m3_u = (location.protocol=='https:'?'https://arbchat.co.uk/serve/www/delivery/ajs.php':'http://arbchat.co.uk/serve/www/delivery/ajs.php');
   var m3_r = Math.floor(Math.random()*99999999999);
   if (!document.MAX_used) document.MAX_used = ',';
   document.write ("<scr"+"ipt type='text/javascript' src='"+m3_u);
   document.write ("?zoneid=12");
   document.write ('&cb=' + m3_r);
   if (document.MAX_used != ',') document.write ("&exclude=" + document.MAX_used);
   document.write (document.charset ? '&charset='+document.charset : (document.characterSet ? '&charset='+document.characterSet : ''));
   document.write ("&loc=" + escape(window.location));
   if (document.referrer) document.write ("&referer=" + escape(document.referrer));
   if (document.context) document.write ("&context=" + escape(document.context));
   if (document.mmm_fo) document.write ("&mmm_fo=1");
   document.write ("'><\/scr"+"ipt>");
//]]]]><![CDATA[>--></script><noscript><a href='https://arbchat.co.uk/serve/www/delivery/ck.php?n=aa0a2ebf&cb=9875486' target='_blank'><img src='https://arbchat.co.uk/serve/www/delivery/avw.php?zoneid=12&cb=9875486&n=aa0a2ebf' border='0' alt='' /></a></noscript>
</div>                        

It is displaying the Stihl banner in the header.  It works if I resize the window to mobile view, and it also works on Android, but for some reason I can't get it to display on iPhone.  I have tried a couple of different phones to make sure its not settings on my phone.  Perhaps anyone here with an iPhone could confirm if it shows for them?

Aside from that i'm stuck.  Anyone got any ideas?  I use the same code to display other banners throughout the site and they are all displaying on iPhone just fine.

 

URL is https://arbtalk.co.uk

And this is what it should look like

 

Thanks in advance!

[Steve Bullman]

Anyone?