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The post link you listed is for JavaScript Image Slider, not for this Ninja Slider. That is why your code doesn't work.
Suppose your page URL contains the query string like this in the page URL: ?slide=2 (or &slide=2) . Then you can add the following script to your page that will direct the image slider to show the specified slide when the page loads.
Note: The index number in the Ninja Slider built-in function, nslider.slide(index), is 0-based. So 2 means the third slide.
<script type="text/javascript">
function switchSlide() {
if (typeof nslider != "undefined" && typeof nslider.getSlides() != "undefined") {
var query = location.search;
var n = query.indexOf('slide=');
if (n != -1) {
var index = parseInt(query.substr(n 6));
nslider.slide(index);
}
else return;
}
else {
setTimeout(switchSlide, 10);
}
}
//run the function
switchSlide();
</script>
The above code block can be added either inside the <head>...</head> section, or within the <body></body> section.