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You can modify the nsOptions in the ninja-slider.js:
var nsOptions = {
......
before: function (currentIdx, nextIdx, manual) {
var sliderCount = document.getElementById(“sliderCount”);
sliderCount.innerHTML = (nextIdx + 1 )+ "/" + nslider.getSlides().length;
},
......
}
For details please read the "Built-in event handlers and functions" section on the page Ninja Slider.