second patch to fix #549. this time, instead of just clearing out everything in the div, it removes only what it added.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@2858 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -228,7 +228,10 @@ OpenLayers.Map.prototype = {
             } 
             this.controls = null;
         }
-        this.div.innerHTML = "";
+        if (this.viewPortDiv) {
+            this.div.removeChild(this.viewPortDiv);
+        }
+        this.viewPortDiv = null;
     },
 
     /**

tests/test_Map.html

@@ -367,7 +367,7 @@
         map.destroy();
         t.eq( map.layers, null, "map.layers is null after destroy" );
         t.eq( map.controls, null, "map.controls is null after destroy" );
-        t.eq( map.div.innerHTML, "", "map's div cleared out");
+        t.eq( map.viewPortDiv, null, "map's viewportDiv nullified");
     }
   // -->
   </script>