if (navigator.userAgent.match(/iPhone/i) || navigator.userAgent.match(/iPad/i)) {
	var viewportmeta = document.querySelectorAll('meta[name="viewport"]')[0];
	if (viewportmeta) {
		viewportmeta.content = 'width=device-width, minimum-scale=1.0, maximum-scale=1.0';
		document.body.addEventListener('gesturestart', function() {
			viewportmeta.content = 'width=device-width, minimum-scale=0.25, maximum-scale=1.6';
		}, false);
	}
}