help-an adsense/adbrite question??

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i have seen now a lot of people saying that one can earn good amount of money from adsense/adbrite. I have an idea about setting a website,which will contain many things about a person,like his photos,his videos,i think i will be able to generete 50-100 vistors per day. but i have a question which is that do we have to set ads on all the pages of the website or we have to set only on the main page(index) of the website. thanx a lot.