detect.js

if (/Android|webOS|iPhone|iPod|iPad|BlackBerry|Nokia/i.test( navigator.userAgent )) {

		if ( bottomStickyBanner.length != 0 ) {

			var BSBisBannerAttached = true;

			var BSBviewScale = new FlameViewportScale();

			var BSBscrollHandler = function (event) {

				if ( bottomStickyBanner.length > 0 )
				{
					// bottomStickyBanner.height();

					if ( BSBisBannerAttached ) {

						bottomStickyBanner.show();
					} else {

						bottomStickyBanner.hide();
					}
				}
			};

			var BSBscaleHandler = function (event)
			{
				var screen_width = getScreenWidth();
				var original_scale_ratio = ( screen_width / document.documentElement.clientWidth );

				// screen is smaller than document - apply scaling
				if ( original_scale_ratio < 1 ) {

					var currentScale = BSBviewScale.getScale();

					if (currentScale > original_scale_ratio && BSBisBannerAttached) {
						BSBisBannerAttached = false;
					} else if (currentScale <= original_scale_ratio && !BSBisBannerAttached) {
						BSBisBannerAttached = true;
					}
				}

				BSBscrollHandler();
			};

			bottom_sticky_show_interval = setInterval( BSBscaleHandler, 1000 );

			// $( window ).bind( 'scroll.bottomSticky', BSBscaleHandler );
			// $( window ).bind( 'touchstart.bottomSticky', BSBscaleHandler );
			// $( window ).bind( 'touchmove.bottomSticky', BSBscaleHandler );
			// $( window ).bind( 'gesturechange.bottomSticky', BSBscaleHandler );
		}
}

function getScreenOrientation() {
	var orientation = window.orientation;
	var ret_val = 'portrait';

	if(orientation === 0 || orientation === 180) {
		ret_val = 'portrait';
	}
	else if(orientation === 90 || orientation === -90) {
		ret_val = 'landscape';
	}
	else {
		// JavaScript orientation not supported. Work it out.
		if(document.documentElement.clientWidth > document.documentElement.clientHeight) {
			ret_val = 'landscape';
		}
		else {
			ret_val = 'portrait';
		}
	}

	return ret_val;
};

function getScreenWidth() {
	var ret_val = screen.width;
	var orientation = getScreenOrientation();

	if(orientation === 'portrait') {
		// Take smaller of the two dimensions
		if(screen.width > screen.height) ret_val = screen.height;

	}
	else {
		// Landscape. Take larger of the two dimensions.
		if(screen.width < screen.height) ret_val = screen.height;

	}

	return ret_val;
};