platform/org.eclipse.platform/intro/css/tutorials.css

a#cvs_checkout img { background-image : url('../../images/topiclabel/tu_checkout48.gif'); }
a#cvs_checkout:hover img { background-image : url('../../images/topiclabel/tu_checkout48_hov.gif'); }

a#cvs_merge img { background-image : url('../../images/topiclabel/tu_merge48.gif'); }
a#cvs_merge:hover img { background-image : url('../../images/topiclabel/tu_merge48_hov.gif'); }