document.addEventListener("DOMContentLoaded", function() {		
	if (navigator.userAgent.match(/iPhone/i) || navigator.userAgent.match(/iPad/i)) {
		var viewportmeta = document.querySelector('meta[name="viewport"]');
		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);
		}
	}
}, false);