Web Applet on Activity - copy Account from existing activity

Hello all....

Creating a custom button on the Activity Layout which copies various fields from an exisitng activity to a new activity.

I am able to copy other fields over but not sure on the HTML syntax for copying the account field when on the activity versus the account.

We have buttons creating activities when on an account page, which copies the account name to the activity...(I think this is our code that is doing that)

&OMTGT=TaskEditForm&OMTHD=ActivityNewNav&OMCBO=Account&OMRET0=AccountDetail%3fOMTHD%3dAccountDetailNav%26OMTGT%3dAccountDetailForm%26AccountDetailForm.Id%3d%%%Row_Id%%%

Since I am not on the account when creating a new task....trying to figure out how to copy the link.