Nasdaq Market Hours If The NYSE Is Closed Today(January 15th,2007),how Come My Stocks On My Yahoo Page Are Going Up And Down?

If the NYSE is closed today(January 15th,2007),how come my stocks on my Yahoo page are going up and down? - nasdaq market hours

It is also close to the bottom of my portfolio in the hours after the market. Who's leg with this information?? In addition, I've been watching Bloomberg TV and CNBC, and their share prices and show the Dow Jones and Nasdaq up and down. What?