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function applePie() {
    return ( navigator.userAgent.match(/(iPhone|iPod|iPad)/i) );
}

$('.fancy-overlay').fancybox({
    your: 'settings',
    afterShow: function() { 
        if ( applePie() ) { $('body').css({'position': 'fixed'}); } 
    },
    afterClose: function() {
        if ( applePie() ) { $('body').css({'position': ''}); }
    }
});