I'd like to create a custom link on the account page, which will link to a report. However, I want the report to only show values for that particular account. For instance, it would show all the activities for that account categorized by type of activity. I'm not sure how to use a link to dynamically customize a report like that. 

I can't figure out how to do this, and SF support sent me here... 

Thanks!
Ariel