emptying folder in gmail


New Email
A friend of mine wanted to go back to the original look gmail (html version) and this worked fine.
Only thing is that to delete the contents of a folder (e.g. the "sent" mail) there seems to be no box to tick, with which to select all the messages in the folder.
I'm sure there used to be one, directly above the boxes for deleting individual messages.
Is there any way to select all the messages in a folder, so as to delete all with one click on the "delete" button?