Remote ads Code snippet is same on all Ad groups

Hi,

In the README.txt said:

For example, you may have a group called "Text Ads" and another group called "Image Ads."

but I cannot doing it because both "Text Ads" and "Image Ads" will appeared in "Image ad" tab with its specific width & length.

So, on Ad Groups, I created 2 groups (I name it "728 x 90" & "160 x 600")... so that I can have different image length & width on every groups.

But when creating the Code snippet on Remote Ads, the Code snippet is same on both "728 x 90" & "160 x 600"

<!--start-->
<script language='JavaScript' type='text/javascript'>
 var adurl = window.location.href;
document.write(
<div class="advertisement group-tids-0" id="group-id-tids-0">"<scr" + "ipt type='text/javascript' src='http://www.domain.com/modules/ad/serve.php?q=1&amp;k=be816ef09d6ce3aa0fde28805ef6f60f&amp;t=0&amp;u="+adurl+"'>"+"</scr" + "ipt>"</div>
)
</script>
<!--end-->

That code snippet also not works..

I have tested different permission, and also input formats... but still not works..

Can you tell me whats wrong?

Thanks in advance