Adsense code in macromedia CSS design

hey
i tried many time in that but i cannot.


so my question is, i wanna to add adsense code in Css template found in dreamwaver default templates

it found in the dreamwaver 8.0 in new templates >>Page design>>Two column left nav

you find in it 280*200 image(incorporated with page contents) , i want to replace this image with adsense code 250*250 to be incorporated with article ,

what can i do, ???
i tried many many but dont know
please help me in that

 

you need to add it to the HTML page of your site, and not the CSS code

 

sure, i tried that but not appear as what i mean ,
i need adsense code , to be as this picture