making pink tiles a css matter. p=rdewit, r=me (closes #2318)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9758 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -342,18 +342,10 @@ OpenLayers.Util.onImageLoad = function() {
     //
     if (!this.viewRequestID ||
         (this.map && this.viewRequestID == this.map.viewRequestID)) { 
-        this.style.backgroundColor ="transparent";
         this.style.display = "";  
     }
 };
 
-/**
- * Property: onImageLoadErrorColor
- * {String} The color tiles with load errors will turn.
- *          Default is "pink"
- */
-OpenLayers.Util.onImageLoadErrorColor = "pink";
-
 /**
  * Property: IMAGE_RELOAD_ATTEMPTS
  * {Integer} How many times should we try to reload an image before giving up?
@@ -388,7 +380,8 @@ OpenLayers.Util.onImageLoadError = function() {
             this.src = this.src;
         }
     } else {
-        this.style.backgroundColor = OpenLayers.Util.onImageLoadErrorColor;
+        this.src = OpenLayers.Util.getImagesLocation() + "blank.gif";
+        OpenLayers.Element.addClass(this, "olImageLoadError");
     }
     this.style.display = "";
 };