dwr.engine.beginBatch = function() {
		showLoadingBar();
		
	  if (dwr.engine._batch) {
	    dwr.engine._handleError(null, { name:"dwr.engine.batchBegun", message:"Batch already begun" });
	    return;
	  }
	  dwr.engine._batch = dwr.engine._createBatch();
	}
	/*
	dwr.engine.endBatch = function(options) {
	  var batch = dwr.engine._batch;
	  if (batch == null) {
	    dwr.engine._handleError(null, { name:"dwr.engine.batchNotBegun", message:"No batch in progress" });
	    return;
	  }
	  dwr.engine._batch = null;
	  if (batch.map.callCount == 0) return;
	
	  if (options) dwr.engine._mergeBatch(batch, options);
	
	  if (dwr.engine._ordered && dwr.engine._batchesLength != 0) {
	    dwr.engine._batchQueue[dwr.engine._batchQueue.length] = batch;
	  }
	  else {
	    dwr.engine._sendData(batch);
	  }
	}
	*/