http://img16.imageshack.us/img16/6771/23709622.jpg

my goal is just to SELECT n DELETE Those lines :
Dialogue: Marked=0,0:02:39.49,0:02:40.49,Default,NTP,0000,00 00,0000,!Effect,
(without the text)

^
take a look at that picture up there... the marked line...
i just need ALL of these lines removed.. i managed to select only one line as you see , its impossible to select it with the mouse:\

I know there's a way to change line number but not the column and start deleting those lines (the column number is static) for example i have 1,062 lines i want to delete.. but delete not the whole line just part of it (colmn 76) so the script will start deleting lines one by one .. is that possible? o; sorry if its too noobish