add .disabled class so it can be used for simple a buttons as well

core/css/styles.css

@@ -98,7 +98,8 @@ input[type="submit"] img, input[type="button"] img, button img, .button img { cu
 /* disabled input fields and buttons */
 input:disabled, input:disabled:hover, input:disabled:focus,
 button:disabled, button:disabled:hover, button:disabled:focus,
-.button:disabled, .button:disabled:hover, .button:disabled:focus {
+.button:disabled, .button:disabled:hover, .button:disabled:focus,
+a.disabled, a.disabled:hover, a.disabled:focus {
 	background: rgba(230,230,230,.9);
 	color: #999;
 	cursor: default;