I need a script really bad, here is what i need :

In Column D I have week numbers ranging from 532 to 543, and then in
column F, i have sales for an item. In column H, i have a forumla : if
(D=IF(D11=541,AVERAGE(F2:F10), " "), how to i create a script to keep
on looping until the end of the file?PLease help!!!Thanks alot