fixScale = function(doc) {

var addEvent = 'addEventListener',

type = 'gesturestart',

qsa = 'querySelectorAll',

scales = [1, 1],

meta = qsa in doc ? doc[qsa]('meta[name=viewport]') : [];

function fix() {

meta.content = 'width=device-width,minimum-scale=' + scales[0] + ',maximum-scale=' + scales[1];

doc.removeEventListener(type, fix, true);

}

if ((meta = meta[meta.length - 1]) && addEvent in doc) {

fix();

scales = [.25, 1.6];

doc[addEvent](type, fix, true);

}

};