How can I tell in Yahoo Finance if the next dividend is quarterly or annual?

The stated amount is an annual total and yield but how do I know if the company is paying a quarterly portion of it? I can't assume that all companies pay quarterly since it seems that Wal-Mart is annual based on the next payment date (Jan 2012). If I compare Carnival and Wal-Mart both indicate the next dividend date and an annual amount but there is no indication of whether the payment is annual or quarterly.