ElementStacks

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<div id="container" style="height: 400px; width: 500px"></div>
<button>zoom out</button>

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },
    xAxis: {
    },
    
    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
    }]
}, function(chart){

    chart.xAxis[0].setExtremes(6, null, true, false);
    
    $('button').click(function(){
        chart.xAxis[0].setExtremes(null, null);
        alert(char.xAxis[0].getExtremes());
    });
    
});