Discuss Alert Manager

Hi,

I would like to deactive all the users for sending an alert from a particular list / all the list. Hence I went in Manage alert options from the Site Settings. I see that there are 800+ users subscribe to the lists. Do I need to select all the check box manually ? is there not a check box like "Select ALL" which would select all the items in the current view.

Please suggest. I would like to purchase this product and for the same am evaluating the product satisfying my needs.

Thanks.