this.public.beforeUnloadChunk = function beforeUnloadChunk (cx, cy) {
		var chunkBeingLoaded = (this.public.requestChunkCallbackList[chunkX] && this.public.requestChunkCallbackList[chunkX][chunkY]) ||
								(this.background.requestChunkCallbackList[chunkX] && this.background.requestChunkCallbackList[chunkX][chunkY])

		var publicCanBeUnloaded = this.public.canBeUnloaded(cx, cy) || (this.public.chunks[cx] && this.public.chunks[cx][cy] == "empty");
		var backgroundCanBeUnloaded = this.background.canBeUnloaded(cx, cy) || (this.background.chunks[cx] && this.background.chunks[cx][cy] == "empty");

		if( !chunkBeingLoaded && (publicCanBeUnloaded || backgroundCanBeUnloaded) ) {

			console.log("Unloading chunk", cx, cy);
			if(publicCanBeUnloaded){
				this.background.chunks[cx][cy] = null;
				delete this.background.chunks[cx][cy];
			}
			if(backgroundCanBeUnloaded){
				this.public.chunks[cx][cy] = null;
				delete this.public.chunks[cx][cy];
			}
			return true;
		}

		return false;
	}.bind(this);