Prevent the default browser behavior without stopping the event propagation.

lib/OpenLayers/Events.js

@@ -167,11 +167,7 @@ OpenLayers.Event = {
     stop: function(event, allowDefault) {
         
         if (!allowDefault) { 
-            if (event.preventDefault) {
-                event.preventDefault();
-            } else {
-                event.returnValue = false;
-            }
+            OpenLayers.Event.preventDefault(event);
         }
                 
         if (event.stopPropagation) {
@@ -181,6 +177,22 @@ OpenLayers.Event = {
         }
     },
 
+    /**
+     * Method: preventDefault
+     * Cancels the event if it is cancelable, without stopping further
+     * propagation of the event.
+     *
+     * Parameters:
+     * event - {Event}
+     */
+    preventDefault: function(event) {
+        if (event.preventDefault) {
+            event.preventDefault();
+        } else {
+            event.returnValue = false;
+        }
+    },
+
     /** 
      * Method: findElement
      *