extend buttons -> disable style

extend/buttons.css

@@ -43,7 +43,7 @@ img.qui-button-text-image {
 }
 
 span.qui-button-text-image {
-    padding: 0px 0 0 10px;
+    padding: 5px 0;
 }
 
 .button:hover {
@@ -52,6 +52,18 @@ span.qui-button-text-image {
     -webkit-box-shadow: 0 0 3px #999;
 }
 
+.button:disabled {
+    cursor: default;
+    filter: progid:DXImageTransform.Microsoft.Alpha(opacity=60);
+    -moz-opacity: 0.6;
+    opacity: 0.6;
+}
+
+.button[disabled]:hover {
+    background: none;
+    color: #606060;
+}
+
 /* black */
 .btn-black {
     color: #d7d7d7;