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

theme/default/style.css

@@ -1,5 +1,5 @@
 div.olMap {
-	z-index: 0;
+    z-index: 0;
     padding: 0px!important;
     margin: 0px!important;
     cursor: default;
@@ -322,6 +322,13 @@ div.olControlSaveFeaturesItemInactive {
  -moz-user-select: none;
 }
 
+.olImageLoadError {
+    border: ridge 2px gray;
+    background: pink url("img/broken.png");
+    background-repeat: no-repeat;
+    background-position: 5px 5px;
+}
+
 /**
  * Cursor styles
  */