I still can't tell what you want... which text are you concerned about?
Studying the View Source reveals:
HTML Code:
<h2 id="cartEmptyText">Your Shopping Cart is empty.</h2>
and
HTML Code:
<body id="shoppingcartBody">
...
<div class="centerBoxWrapper" id="whatsNew">
<h2 class="centerBoxHeading">New Products For August</h2>
Thus, to turn off all images for the "Your shopping cart is empty" text, you could use:
h2#cartEmptyText { background-image: none; }
or to turn off the image for the What's New title, you could use:
#shoppingcartBody #whatsNew h2.centerBoxHeading { background-image: none;}