// http://www.blog.highub.com/mobile-2/a-fix-for-iphone-viewport-scale-bug/
// http://adactio.com/journal/4470/


var viewportmeta = document.querySelector && document.querySelector('meta[name="viewport"]'),
    ua = navigator.userAgent,

    gestureStart = function () {
        viewportmeta.content = "width=device-width, minimum-scale=0.25, maximum-scale=1.6";
    },

    scaleFix = function () {
      if (viewportmeta && /iPhone|iPad/.test(ua) && !/Opera Mini/.test(ua)) {
        viewportmeta.content = "width=device-width, minimum-scale=1.0, maximum-scale=1.0";
        document.addEventListener("gesturestart", gestureStart, false);
      }
    };
    

scaleFix();