Pulled up r679:r684 from trunk for the IE performance and bug fixes.

git-svn-id: http://svn.openlayers.org/branches/openlayers/1.0@685 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/MouseDefaults.js

@@ -55,6 +55,7 @@ OpenLayers.Control.MouseDefaults.prototype =
             this.zoomBox.style.zIndex = this.map.Z_INDEX_BASE["Popup"] - 1;
             this.map.viewPortDiv.appendChild(this.zoomBox);
         }
+        document.onselectstart=function() { return false; }
         Event.stop(evt);
     },
 
@@ -111,6 +112,7 @@ OpenLayers.Control.MouseDefaults.prototype =
         } else {
             this.map.setCenter(this.map.center);
         }
+        document.onselectstart=null;
         this.mouseDragStart = null;
         this.map.div.style.cursor = "default";
     },