// window.onload=function () {
	document.addEventListener('touchstart',function (event) {
	  if(event.touches.length>1){
		event.preventDefault();
	  }
	});
	var lastTouchEnd=0;
	document.addEventListener('touchend',function (event) {
	  var now=(new Date()).getTime();
	  if(now-lastTouchEnd<=300){
		event.preventDefault();
	  }
	  lastTouchEnd=now;
	},false);
	document.addEventListener('gesturestart', function (event) {
	  event.preventDefault();
	});
// }