make sure scroll only scrolls if it was done over the map, and also stop event propagation so that the window doesnt scroll too

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1246 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/MouseDefaults.js

@@ -183,6 +183,20 @@ OpenLayers.Control.MouseDefaults.prototype =
      * @param {Event} e
      */
     onWheelEvent: function(e){
+    
+        // first determine whether or not the wheeling was inside the map
+        var inMap = false;
+        var elem = Event.element(e);
+        while(elem != null) {
+            if (elem == this.map.div) {
+                inMap = true;
+                break;
+            }
+            elem = elem.parentNode;
+        }
+        
+        if (inMap) {
+            
             var delta = 0;
             if (!e) {
                 e = window.event;
@@ -202,6 +216,10 @@ OpenLayers.Control.MouseDefaults.prototype =
                    this.defaultWheelUp();
                 }
             }
+            
+            //only wheel the map, not the window
+            Event.stop(e);
+        }
     },