Getting to display 'Shopping Cart (0)'

Hello,

I'm trying to get the 'Shopping Cart (0) to display on my website so customers can see how many items are in their cart and can click on it to take them to the cart. I have it set up statically, but am unsure of how to get it to function. Here is the static code I have:

<li><a href="link-to-shopping-cart" class="viewCart"><span class="viewCart">(0) (show amount in cart)</span></a></li>

I feel like it should be a simple snippet of code that does where the (0) is, but not too sure.

Thanks.