sniff a mobile browser

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function
isMobile() {   //sniff a mobile browser

            if
(navigator.userAgent.match(/Android/i) ||

                navigator.userAgent.match(/webOS/i) ||

                navigator.userAgent.match(/iPad/i) ||

                navigator.userAgent.match(/iPhone/i) ||

                navigator.userAgent.match(/iPod/i)

                ) {

                return
true;

            }

        }