Banners Mod

Ok, you place a banner in the banner tools and it shows up lets say the bottom of the page....well, thats actually pasted on a whole other file like footer.html and Im not really sure what this files is or where and I'd also like to know the direct address to the file that holds the banner like mysite.com/footer.html can anyone help me with this and possibly the right banner too??? all I need is the location of the files that hold the banners and the address.

Ok, I have solved this issue with using CPM ads and not getting impressions for every page. Thanks