Geoserver WMS: Tiled and SingleTile Layer

gistfile1.js

// Tiled Layer
the_layer =  new OpenLayers.Layer.WMS( 
  			"My Layer",
        "http://localhost:8080/geoserver/merapi/wms", 
				{
					layers: 'merapi:desa',
					isBaseLayer: false,
					tiled: true,
					format: 'image/png',
					tilesOrigin : map.maxExtent.left + ',' + map.maxExtent.bottom,
          yx : {'EPSG:26713' : false},
          transparent: "true"
        },
				{
					'buffer': 0
				}
			);

// SingleTile Layer
the_layer =  new OpenLayers.Layer.WMS( 
				"My Layer",
        "http://localhost:8080/geoserver/merapi/wms", 
				{
					layers: 'merapi:desa',
					isBaseLayer: false,
					format: 'image/png',
					yx : {'EPSG:26713' : false},
					transparent: "true"
				},
				{
					singleTile: true, 
					ratio: 1,
					'buffer': 0
				}
			);