function headMove() {

            $('li').each(function () {

                var myLeft = Math.floor(Math.random()*(myWidth+1))-128;

                var myTop = Math.floor(Math.random()*(myHeight+1))-128;

                if (myLeft < 0) {

                    myLeft = 0;

                }

                if (myTop < 0) {

                    myTop = 0;

                }

                $(this).animate({left:myLeft,top:myTop},15000,'linear')

            })

        }