1. A network server for presenting network transactions requiring different levels of security to a user for approval, comprising: a communications port configured to receive a transaction having a predetermined security level from a network site transacting with the user; a processor configured to direct (1) presentation of the transaction to the user in one of a group of presentation forms including at least two of (i) a first form of presentation corresponding to presentation of the transaction in a browser pop-up window on a first network device associated with the user, (ii) a second form of presentation corresponding to presentation of the transaction in a security software application window on the first network device, and (iii) a third form of presentation corresponding to presentation of the transaction in a security application window on a second network device associated with the user and different than the first network device, wherein the one presentation form corresponds to the predetermined security level for the transaction, and (2) a request for approval of the transaction by the user corresponding to one of a group of transaction approval types including at least two of (i) a first type approval requiring no action by the user after presentation of the transaction, (ii) a second type approval requiring the user to actively approve the presented transaction, and (iii) a third type approval requiring the user to sign the presented transaction; wherein the communications port is further configured to receive an identifier of the one transaction presentation form and the one transaction approval type from the network site; wherein the one transaction approval type corresponds to the predetermined security level for the transaction.