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

@@ -183,24 +183,42 @@ OpenLayers.Control.MouseDefaults.prototype =
      * @param {Event} e
      */
     onWheelEvent: function(e){
-        var delta = 0;
-        if (!e) {
-            e = window.event;
-        }
-        if (e.wheelDelta) {
-            delta = e.wheelDelta/120; 
-            if (window.opera) {
-                delta = -delta;
+    
+        // 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;
             }
-        } else if (e.detail) {
-            delta = -e.detail / 3;
+            elem = elem.parentNode;
         }
-        if (delta) {
-            if (delta < 0) {
-               this.defaultWheelDown();
-            } else {
-               this.defaultWheelUp();
+        
+        if (inMap) {
+            
+            var delta = 0;
+            if (!e) {
+                e = window.event;
             }
+            if (e.wheelDelta) {
+                delta = e.wheelDelta/120; 
+                if (window.opera) {
+                    delta = -delta;
+                }
+            } else if (e.detail) {
+                delta = -e.detail / 3;
+            }
+            if (delta) {
+                if (delta < 0) {
+                   this.defaultWheelDown();
+                } else {
+                   this.defaultWheelUp();
+                }
+            }
+            
+            //only wheel the map, not the window
+            Event.stop(e);
         }
     },