diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index e93b634e29..736972b30f 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -146,7 +146,7 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
                                         new OpenLayers.Pixel(tileoffsetx - parseInt(this.map.layerContainerDiv.style.left),
                                                              tileoffsety - parseInt(this.map.layerContainerDiv.style.top))
                                                             );
-                tile.draw((this.params.TRANSPARENT == true));
+                tile.draw((this.params.TRANSPARENT == 'true'));
                 row.append(tile);
      
                 tileoffsetlon += tilelon;       
@@ -181,7 +181,7 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
             bounds.top = bounds.top + deltaLat;
             position.y = position.y + deltaY;
             var newTile = this.addTile(bounds, position);
-            newTile.draw();
+            newTile.draw((this.params.TRANSPARENT == 'true'));
             newRow.append(newTile);
         }
         
@@ -215,7 +215,7 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
             bounds.right = bounds.right + deltaLon;
             position.x = position.x + deltaX;
             var newTile = this.addTile(bounds, position);
-            newTile.draw();
+            newTile.draw((this.params.TRANSPARENT == 'true'));
             
             if (prepend) {
                 row = row.prepend(newTile);