rem: if (this.map.getResolution() <= (this.lzd/512) && this.getZoom() <= this.zoomLevels) { var url = this.getURL(bounds); return new OpenLayers.Tile.Image(this, position, bounds, url, this.tileSize); } else { return new OpenLayers.Tile.Image(this, position, bounds, OpenLayers.Util.getImagesLocation() + "blank.gif", this.tileSize); } 
add: return new OpenLayers.Tile.Image(this, position, bounds, null, this.tileSize); 
context:     addTile:function(bounds,position) {        if (this.map.getResolution() <= (this.lzd/512)            && this.getZoom() <= this.zoomLevels) {            var url = this.getURL(bounds);            return new OpenLayers.Tile.Image(this, position, bounds,                                              url, this.tileSize);        } else {            return new OpenLayers.Tile.Image(this, position, bounds,                        OpenLayers.Util.getImagesLocation() + "blank.gif",                        this.tileSize);        }    },
meta: 4411	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4411/0102ec4fe46e9d76fca5f16077e3a1253541b602/WorldWind.js/buggy/lib/OpenLayers/Layer/WorldWind.js