change these alerts so as not to confuse ourselves when grepping for alerts to remove debugging code. :-)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@876 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Events.js

@@ -91,11 +91,11 @@ OpenLayers.Events.prototype = {
      *   methods of the Bounds object through the "this" variable. So our 
      *   callback could execute something like: 
      *   
-     *     alert("Left: " + this.left);
+     *     leftStr = "Left: " + this.left;
      *   
      *                   or
      *  
-     *     alert("Center: " + this.getCenterLonLat());
+     *     centerStr = "Center: " + this.getCenterLonLat();
      * 
      */
     register: function (type, obj, func) {