score:14

Accepted answer

finally, i figured it out like this. may be it will help others.

function callback($this){
    var img = $this.renderer.image('images/zoom_icon.png',$this.chartwidth-40,5,40,12); 
    img.add(); 
    img.css({'cursor':'pointer'});
    img.attr({'title':'pop out chart'});
    img.on('click',function(){
              // prcessing after image is clicked
    });

 }

new highcharts.chart(charts.params,callback);

// where charts.params is object which contains options for chart

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