Approved commit for #473 by euzuro. Needs pullup to 2.3.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@2163 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Tile/Image.js

@@ -117,12 +117,14 @@ OpenLayers.Tile.Image.prototype =
         
         this.imgDiv.className = 'olTileImage';
 
-        /* checkImgURL *should* pretty predictably get called after the
-             createImage / createAlphaImageDiv onLoad handler */
+        /* checkImgURL used to be used to called as a work around, but it
+           ended up hiding problems instead of solving them and broke things
+           like relative URLs. See discussion on the dev list:
+           http://openlayers.org/pipermail/dev/2007-January/000205.html
 
         OpenLayers.Event.observe( this.imgDiv, "load",
                         this.checkImgURL.bindAsEventListener(this) );
-
+        */
         this.layer.div.appendChild(this.imgDiv);
         if(this.layer.opacity != null) {
             
@@ -139,6 +141,14 @@ OpenLayers.Tile.Image.prototype =
      * the imgDiv display to 'none', as either (a) it will be reset to visible
      * when the new URL loads in the image, or (b) we don't want to display
      * this tile after all because its new bounds are outside our maxExtent.
+     * 
+     * This function should no longer  be neccesary with the improvements to
+     * Grid.js in OpenLayers 2.3. The lack of a good isEquivilantURL function
+     * caused problems in 2.2, but it's possible that with the improved 
+     * isEquivilant URL function, this might be neccesary at some point.
+     * 
+     * See discussion in the thread at 
+     * http://openlayers.org/pipermail/dev/2007-January/000205.html
      *
      * @private
      */