Recently I bought adsense site with many pages and I' like to know is there any quick method to replace pub code on all pages instead do it manually?
Im not aware of whats setup exactly but there could be one page/file (eg. ads.php) that contains the code in it that in then displays the adsense ads on all of the pages. You could try asking the person that you bought it from and they might be able to tell you for sure.
u can try using search and replace in dreamweaver .. but its better to just do it manually if the code is not just ina a ads.php type thing