//------------------------------------------------------------------------
// Test whether client device supports touch.  
//
// Hide the element with ID as ‘touch-only’ if the web page is viewed 
// on a device that doesn’t have a touch screen. This should work on 
// all desktop and mobile devices including iOS, Android, Opera, 
// Chrome, IE, Safari and Windows Phone.
// 
// if (!is_touch_device()) {
//   document.getElementById('touch-only').style.display='none';
// }
// 
// Credits: http://ctrlq.org/code/19616-detect-touch-screen-javascript
//-----------------------------------------------------------------------
function isTouchDevice() 
{
    return (('ontouchstart' in window)
        || (navigator.MaxTouchPoints > 0)
        || (navigator.msMaxTouchPoints > 0)
    );
}