We have modules on our site in which advertisers can sponsor. The banner size should there be a sponsor is 318×60. However if we do not have a sponsor for that position we do not want a banner to appear. We had to use the iFrame version for the Zone under the direction of Advert because of spacing issues for the modules. I created a 318×1 image tried putting it as the default image of the zone and made the 318×1 compatible with the 318×60 so they can be interchanged when sponsors are cycled through.. but it is not working properly. that made the 318×1 image to stretch out to the 60 height.. so i added a campaign with a 318×1 image as the media but that is not working either.. Because of the iframe code the 318×1 image appears but it is surround by whitespace to match the height of the settings for the zone of a height of 60.