https://www.cyaecconsultores.es/wp-content/themes/vancura-pro/js/slider.js?ver=1.1

1/**
2 * Creating a slider
3 * 
4 **/
5var $ = jQuery.noConflict();
6$(function(){
7	var pos = 0;
8	var prev = 0;
9	var next = 0;
10	var hidden = 0;
11	$('.slide-prev').on('click', function(){
12		// console.log($(this).parent().find('.slide'));
13		slide($(this).parent().find('.slides'), 0);
14	});
15
16	$('.slide-next').on('click', function(){
17		// console.log($(this).parent().find('.slide'));
18		slide($(this).parent().find('.slides'), 1);
19	});
20
21	var getClilds = function(parent){
22		// console.log(parent.children());
23		// console.log(parent.children().length);
24		return parent.children().length;
25	}
26
27	var slide = function (parent, step){
28		var totalItms = getClilds(parent);
29		var parentWidth = parent.parent().outerWidth();
30		var sliderWidth = parent.width();
31		var itemWidth = parseInt(parent.children().first().width());
32		itemWidth = itemWidth + parseInt(parent.children().first().css('margin-left')) + parseInt(parent.children().first().css('margin-right')) + parseInt(parent.children().first().css('padding-left')) + parseInt(parent.children().first().css('padding-right'));
33		pos = parseInt(parent.css('left'));
34
35		if(pos == 0 || isNaN(pos)){
36			prev = 0 ;
37		}else{
38			prev = Math.abs(Math.round(pos / itemWidth));
39		}
40		var showing = Math.round(parentWidth / itemWidth);
41		hidden = (totalItms - showing);
42
43console.log(itemWidth);
44console.log(prev);
45		// if(sliderWidth > ((pos*-1) + (itemWidth*showing)) && pos <= 0){
46		if(prev <= hidden-1 && step == 1){
47			++prev;
48			// pos = pos - itemWid
49		}else if(prev > 0 &&  0===step){
50			--prev;
51			// pos = pos + itemWidth;
52		}
53		pos = prev * itemWidth;
54		pos = pos * -1;
55console.log(pos);
56		parent.css('left', pos+'px');
57	}
58});