如何在横向设备上加载android方向检测这个功能？

下面的代码用来在android设备上检测方向，在旋转设备上加载样式表时很好用，但是如果设备是横向的(在JS中是90 / -90) ，下面的代码就不对了。如何在横向设备上加载android 方向检测这个功能呢？

 //detect orientation change
var supportsOrientationChange = "onorientationchange" in window,
orientationEvent = supportsOrientationChange ? "orientationchange" : "resize";
    window.addEventListener(orientationEvent, function() {
        if(window.orientation == 90) {

            $('link[title=android]')[0].disabled=true;
            $("head").append($("<link title='android_90' rel='stylesheet' href='css/android_90.css' type='text/css' />"));
        } else if (window.oreintation == -90) {

            $('link[title=android]')[0].disabled=true;
            $("head").append($("<link title='android_90' rel='stylesheet' href='css/android_90.css' type='text/css' />"));
        } else if (window.oreintation == 0){

            $('link[title=android_90]')[0].disabled=true;
            $("head").append($("<link title='android' rel='stylesheet' href='css/android.css' type='text/css' />"));
        } else if (window.oreintation == 180){

            $('link[title=android_90]')[0].disabled=true;
            $("head").append($("<link title='android' rel='stylesheet' href='css/android.css' type='text/css' />"));
        }
    }, false);

    //check on window.load
    $(document).ready(function () {
      if(window.orientation == 90) {

            $('link[title=android]')[0].disabled=true;
            $("head").append($("<link title='android_90' rel='stylesheet' href='css/android_90.css' type='text/css' />"));
        } else if (window.oreintation == -90) {

            $('link[title=android]')[0].disabled=true;
            $("head").append($("<link title='android_90' rel='stylesheet' href='css/android_90.css' type='text/css' />"));
        } else if (window.oreintation == 0){

            $('link[title=android_90]')[0].disabled=true;
            $("head").append($("<link title='android' rel='stylesheet' href='css/android.css' type='text/css' />"));
        } else if (window.oreintation == 180){

            $('link[title=android_90]')[0].disabled=true;
            $("head").append($("<link title='android' rel='stylesheet' href='css/android.css' type='text/css' />"));
        }
    });