Can someone please show me how to activate autoplay for the sliders on this script

(function($) {
$.fn.parallaxSlider = function(options) {
var opts = $.extend({}, $.fn.parallaxSlider.defaults, options);
return this.each(function() {
var $pxs_container = $(this),
o = $.meta ? $.extend({}, opts, $pxs_container.data()) : opts;

//the main slider
var $pxs_slider = $('.pxs_slider',$pxs_container),
//the elements in the slider
$elems = $pxs_slider.children(),
//total number of elements
total_elems = $elems.length,
//the navigation buttons
$pxs_next = $('.pxs_next',$pxs_container),
$pxs_prev = $('.pxs_prev',$pxs_container),
//the bg images
$pxs_bg1 = $('.pxs_bg1',$pxs_container),
$pxs_bg2 = $('.pxs_bg2',$pxs_container),
$pxs_bg3 = $('.pxs_bg3',$pxs_container),
//current image
current = 0,
//the thumbs container
$pxs_thumbnails = $('.pxs_thumbnails',$pxs_container),
//the thumbs
$thumbs = $pxs_thumbnails.children(),
//the interval for the autoplay mode
slideshow,
//the loading image
$pxs_loading = $('.pxs_loading',$pxs_container),
$pxs_slider_wrapper = $('.pxs_slider_wrapper',$pxs_container);

//first preload all the images
var loaded = 0,
$images = $pxs_slider_wrapper.find('img');

$images.each(function(){
var $img = $(this);
$('<img/>').load(function(){

++loaded;

if(loaded == total_elems*2){

$pxs_loading.hide();
$pxs_slider_wrapper.show();

//one images width (assuming all images have the same sizes)
var one_image_w = $pxs_slider.find('img:first').width();

/*
need to set width of the slider,
of each one of its elements, and of the
navigation buttons
*/
setWidths($pxs_slider,
$elems,
total_elems,
$pxs_bg1,
$pxs_bg2,
$pxs_bg3,
one_image_w,
$pxs_next,
$pxs_prev);

var spaces = one_image_w/(total_elems+1);
$thumbs.each(function(i){


});

//make the first thumb be selected
highlight($thumbs.eq(0));

//slide when clicking the navigation buttons
$pxs_next.bind('click',function(){
if (slideshow)
{
s_t();
}
++current;
if(current >= total_elems)
if(o.circular)
current = 0;
else{
--current;
return false;
}
highlight($thumbs.eq(current));
slide(current,
$pxs_slider,
$pxs_bg3,
$pxs_bg2,
$pxs_bg1,
o.speed,
o.easing,
o.easingBg,
o.animDone); // ДОБАВИЛ
});

$pxs_prev.bind('click',function(){
--current;
if(current < 0)
if(o.circular)
current = total_elems - 1;
else{
++current;
return false;
}
highlight($thumbs.eq(current));
slide(current,
$pxs_slider,
$pxs_bg3,
$pxs_bg2,
$pxs_bg1,
o.speed,
o.easing,
o.easingBg,
o.animDone); // ДОБАВИЛ
});

/*
clicking a thumb will slide to the respective image
*/
$thumbs.bind('click',function(){
var $thumb = $(this);
highlight($thumb);
//if autoplay interrupt when user clicks
if(o.auto)
clearInterval(slideshow);
current = $thumb.index();
slide(current,
$pxs_slider,
$pxs_bg3,
$pxs_bg2,
$pxs_bg1,
o.speed,
o.easing,
o.easingBg,
o.animDone); // ДОБАВИЛ
});


var int_c = 0;

/*
activate the autoplay mode if
that option was specified
*/

function s_t($){

if(o.auto != 0){
o.circular = true;
if (slideshow) clearInterval(slideshow);
slideshow = setInterval(function(){
int_c = 1;
$pxs_next.trigger('click');
int_c = 0;
},o.auto);
};

}

s_t();

/*
when resizing the window,
we need to recalculate the widths of the
slider elements, based on the new windows width.
we need to slide again to the current one,
since the left of the slider is no longer correct
*/
$(window).resize(function(){
w_w = $(window).width();
setWidths($pxs_slider,$elems,total_elems,$pxs_bg1,$pxs_bg2,$pxs_bg3,one_image_w,$pxs_next,$pxs_prev);
slide(current,
$pxs_slider,
$pxs_bg3,
$pxs_bg2,
$pxs_bg1,
1,
o.easing,
o.easingBg);
});


}
}).error(function(){
}).attr('src',$img.attr('src'));
});



});
};

//the current windows width
var w_w = $(window).width();

var slide = function(current,
$pxs_slider,
$pxs_bg3,
$pxs_bg2,
$pxs_bg1,
speed,
easing,
easingBg,
animDone){
var slide_to = parseInt(-w_w * current);
$pxs_slider.stop().animate({
left : slide_to + 'px'
},speed, easing, function () {
var parent=$pxs_slider.children().eq(current);
if (animDone) animDone.apply(this, [parent]);
});
$pxs_bg3.stop().animate({
left : slide_to/2 + 'px'
},speed, easingBg);
$pxs_bg2.stop().animate({
left : slide_to/4 + 'px'
},speed, easingBg);
$pxs_bg1.stop().animate({
left : slide_to/8 + 'px'
},speed, easingBg);
};

var highlight = function($elem){
$elem.siblings().removeClass('selected');
$elem.addClass('selected');
};

var setWidths = function($pxs_slider,
$elems,
total_elems,
$pxs_bg1,
$pxs_bg2,
$pxs_bg3,
one_image_w,
$pxs_next,
$pxs_prev){
/*
the width of the slider is the windows width
times the total number of elements in the slider
*/
var pxs_slider_w = w_w * total_elems;
$pxs_slider.width(pxs_slider_w + 'px');
//each element will have a width = windows width
$elems.width(w_w + 'px');
/*
we also set the width of each bg image div.
The value is the same calculated for the pxs_slider
*/
$pxs_bg1.width(pxs_slider_w + 'px');
$pxs_bg2.width(pxs_slider_w + 'px');
$pxs_bg3.width(pxs_slider_w + 'px');
};

$.fn.parallaxSlider.defaults = {
auto : 0, //how many seconds to periodically slide the content.
//If set to 0 then autoplay is turned off.
speed : 1600,//speed of each slide animation
easing : 'easeInOutCubic',//easing effect for the slide animation
easingBg : 'easeInOutCubic',//easing effect for the background animation
circular : true,//circular slider
thumbRotation : true, //the thumbs will be randomly rotated

animDone : null // ДОБАВИЛ СВОЙСТВО
};
//easeInOutExpo,easeInBack
})(jQuery);