We have a couple of the same size zones on our website pages, such as a 600 left and a 600 right. We have a 600 campaign running in both zones but they tend to show up at the same time on both zones? So when someone views the page they seem the same banner on the left and right side of the navigation. How do set up the campaigns to never show up at the same time in the same size zone on the page? I know I probably cannot explain this very well so I included a picture as an example to better show in detail my problem. I appreciate the help!