upgrade Dojo to 1.6.1

lib/dijit/themes/tundra/form/RadioButton.css

@@ -1,7 +1,7 @@
 
-.tundra .dijitRadio,			
-.tundra .dijitRadioIcon	{		
-	background-image: url('../images/checkmark.png'); 
+.tundra .dijitRadio,			/* stand alone */
+.tundra .dijitRadioIcon	{		/* inside a toggle button */
+	background-image: url('../images/checkmark.png'); /* checkbox sprite image */
 	background-repeat: no-repeat;
 	width: 16px;
 	height: 16px;
@@ -10,35 +10,43 @@
 }
 .dj_ie6 .tundra .dijitRadio,
 .dj_ie6 .tundra .dijitRadioIcon	{
-	background-image: url('../images/checkmark.gif'); 
+	background-image: url('../images/checkmark.gif'); /* checkbox sprite image */
 }
+
 .tundra .dijitToggleButton .dijitRadioIcon {
-	
+	/* for checkbox in a toggle button, override above setting to have no border */
 	background-image: url('../images/checkmarkNoBorder.png');
 }
 .dj_ie6 .tundra .dijitToggleButton .dijitRadioIcon {
 	background-image: url('../images/checkmarkNoBorder.gif');
 }
+
 .tundra .dijitRadio,
 .tundra .dijitRadioIcon {
-	
+	/* unselected */
 	background-position: -112px;
 }
+
 .tundra .dijitRadioDisabled {
-	
+	/* unselected and disabled */
 	background-position: -144px;
 }
+
 .tundra .dijitRadioHover {
-	
+	/* hovering over an unselected enabled radio button */
 	background-position: -176px;
 }
+
 .tundra .dijitRadioChecked,
 .tundra .dijitRadioCheckedHover,
 .tundra .dijitToggleButtonChecked .dijitRadioIcon {
-	
+	/* selected.  Since clicking a selected radio button doesn't change anything, there's
+	 * no hover effect on selected radio buttons.
+	 */
 	background-position: -96px;
 }
+
 .tundra .dijitRadioCheckedDisabled {
-	
+	/* selected but disabled */
 	background-position: -128px;
 }