how can i use the banner impression i have for some blog??

@dipak06 (913)
April 11, 2010 1:31am CST
hi guys...first of all i want to know what is banner impression??how it differs from credit??/which is better??banner impression or credit??actually i have a huge amount of banner impression and i don;t know how to use it??and also i have seen that there is a option to convert the banner impression to credit??please give me a clear idea about banner impression.....
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