have the Tile add itself to it's layer's div. give it a destroy() function that removes itself

git-svn-id: http://svn.openlayers.org/trunk/openlayers@510 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Tile/Image.js

@@ -22,6 +22,11 @@ OpenLayers.Tile.Image.prototype =
         OpenLayers.Tile.prototype.initialize.apply(this, arguments);
     },
 
+    destroy: function() {
+        this.layer.div.removeChild(this.img);
+        this.img = null;
+    },
+
     /**
     */
     draw:function() {
@@ -31,6 +36,7 @@ OpenLayers.Tile.Image.prototype =
                                                this.size,
                                                this.url,
                                                "absolute");
+        this.layer.div.appendChild(this.img);
     },
 
     /** @final @type String */