+
+.alertCloseButton {
+ list-style-image: url("chrome://global/skin/icons/close.png");
+ -moz-image-region: rect(0, 16px, 16px, 0);
+ padding: 4px 2px;
+}
+
+.alertCloseButton:hover,
+.alertCloseButton:hover:active {
+ -moz-image-region: rect(0, 32px, 16px, 16px);
+}