WQP

html: $('.slidesjs-control img').eq( t ).attr('alt')

function nthChild($multiplier, $addition, $max)
{
    $validInedexes = array();

    for ($n = 0; $n < $max; $n++)
    {
        $idx = $multiplier * $n + $addition;
        if ($idx > $max)
        {
            return $validInedexes;
        }
        $validInedexes[] = ($idx - 1);
    }
}

.ct-series-a .ct-bar, .ct-series-a .ct-line, .ct-series-a .ct-point, .ct-series-a .ct-slice-donut {
	stroke: blue;
	stroke-width: 10px !important;
}

.ct-series-b .ct-bar, .ct-series-b .ct-line, .ct-series-b .ct-point, .ct-series-b .ct-slice-donut {
    stroke: yellow;
	 stroke-width: 10px !important;
}

$(document).on("click", ".preview", function(event){
event.preventDefault()
....
});