rem: var size = this.map.getSize().clone(); 
add: size = this.map.getSize().clone(); 
context:     setTileSize: function(size) {         if (this.singleTile) {            var size = this.map.getSize().clone();            size.h = parseInt(size.h * this.ratio);            size.w = parseInt(size.w * this.ratio);        }         OpenLayers.Layer.HTTPRequest.prototype.setTileSize.apply(this, [size]);    },
meta: 1027	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1027/4564090ee7a50c041861dab909c67b6db49cac42/Grid.js/buggy/lib/OpenLayers/Layer/Grid.js