Fix an issue where window levels weren't kept in sync with dom window layers.

Closes #507.

AppKit/CPMenu/_CPMenuBarWindow.j

@@ -61,8 +61,7 @@ var _CPMenuBarWindowBackgroundColor = nil,
 
     if (self)
     {
-        // FIXME: http://280north.lighthouseapp.com/projects/13294-cappuccino/tickets/39-dont-allow-windows-to-go-above-menubar
-        [self setLevel:-1];//CPTornOffMenuWindowLevel];
+        [self setLevel:CPMainMenuWindowLevel];
         [self setAutoresizingMask:CPWindowWidthSizable];
      
         var contentView = [self contentView];

AppKit/CPWindow/CPWindow.j

@@ -783,6 +783,11 @@ CPTexturedBackgroundWindowMask
 */
 - (void)setLevel:(int)aLevel
 {
+    if (aLevel === _level)
+        return;
+
+    [_platformWindow moveWindow:self fromLevel:_level toLevel:aLevel];
+
     _level = aLevel;
 
     if ([self _sharesChromeWithPlatformWindow])

AppKit/Platform/CPPlatformWindow.j

@@ -196,6 +196,20 @@ var PrimaryPlatformWindow   = NULL;
 #endif
 }
 
+- (void)moveWindow:(CPWindow)aWindow fromLevel:(int)fromLevel toLevel:(int)toLevel
+{
+#if PLATFORM(DOM)
+    if (!aWindow._isVisible)
+        return;
+
+    var fromLayer = [self layerAtLevel:fromLevel create:NO],
+        toLayer = [self layerAtLevel:toLevel create:YES];
+
+    [fromLayer removeWindow:aWindow];
+    [toLayer insertWindow:aWindow atIndex:CPNotFound];
+#endif
+}
+
 - (void)setLevel:(CPInteger)aLevel
 {
     _level = aLevel;

AppKit/Platform/DOM/CPPlatformWindow+DOM.j

@@ -305,7 +305,6 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
         touchEventImplementation = class_getMethodImplementation(theClass, touchEventSelector),
         touchEventCallback = function (anEvent) { touchEventImplementation(self, nil, anEvent); };
 
-
     if (theDocument.addEventListener)
     {
         if ([CPPlatform supportsDragAndDrop])
@@ -1109,7 +1108,7 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
  (CPArray)orderedWindowsAtLevel:(int)aLevel
 {
     var layer = [self layerAtLevel:aLevel create:NO];
-    
+
     if (!layer)
         return [];
     
@@ -1119,7 +1118,7 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
 - (CPDOMWindowLayer)layerAtLevel:(int)aLevel create:(BOOL)aFlag
 {
     var layer = [_windowLayers objectForKey:aLevel];
-    
+
     // If the layer doesn't currently exist, and the create flag is true,
     // create the layer.
     if (!layer && aFlag)
@@ -1127,7 +1126,7 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
         layer = [[CPDOMWindowLayer alloc] initWithLevel:aLevel];
         
         [_windowLayers setObject:layer forKey:aLevel];
-        
+
         // Find the nearest layer.  This is similar to a binary search, 
         // only we know we won't find the value.
         var low = 0,
@@ -1144,7 +1143,11 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
                 low = middle + 1;
         }
 
-        [_windowLevels insertObject:aLevel atIndex:_windowLevels[middle] > aLevel ? middle : middle + 1];
+        var insertionIndex = 0;
+        if (middle !== undefined) 
+            insertionIndex = _windowLevels[middle] > aLevel ? middle : middle + 1
+
+        [_windowLevels insertObject:aLevel atIndex:insertionIndex];
         layer._DOMElement.style.zIndex = aLevel;
         _DOMBodyElement.appendChild(layer._DOMElement);
     }
@@ -1158,15 +1161,19 @@ var supportsNativeDragAndDrop = [CPPlatform supportsDragAndDrop];
 
     // Grab the appropriate level for the layer, and create it if 
     // necessary (if we are not simply removing the window).
-    var layer = [self layerAtLevel:[aWindow level] create:aPlace != CPWindowOut];
-        
+    var layer = [self layerAtLevel:[aWindow level] create:aPlace !== CPWindowOut];
+
     // Ignore otherWindow, simply remove this window from it's level.  
     // If layer is nil, this will be a no-op.
-    if (aPlace == CPWindowOut)
+    if (aPlace === CPWindowOut)
         return [layer removeWindow:aWindow];
 
+    var insertionIndex = CPNotFound;
+    if (otherWindow)
+        insertionIndex = aPlace === CPWindowAbove ? otherWindow._index + 1 : otherWindow._index;
+
     // Place the window at the appropriate index.
-    [layer insertWindow:aWindow atIndex:(otherWindow ? (aPlace == CPWindowAbove ? otherWindow._index + 1 : otherWindow._index) : CPNotFound)];
+    [layer insertWindow:aWindow atIndex:insertionIndex];
 }
 
 - (void)_removeLayers