Changing nop commerce logo image?

I'm moving along pretty well on most of my store, and am greatly pleased with the nop commerce, but can't figure out how to change the nopcommerce logo on the pages to my own.

How do I do this?

Thanks
  Greg

First Method

In your nopCommerceProject

Go to app_themes/ChooseYourCurrentTheme/images/logo.gif

replace the default image with your logo and name it as logo.gif

OR

Second Method

Save your logo in this location : app_themes/ChooseYourCurrentTheme/images/

Now go to app_themes/ChooseYourCurrentTheme/master.css  (Open the file master.css)

find this code below and change logo.gif with YourImage/logo.gif
--------------
a.logo
{
  background: url('images/logo.gif');
---------------

thanks will give it a try..