$(document).ready(function(){

    picts_len = $(".scale_img").length;
    for (var i=0;i<picts_len;i++) {
        pict = $(".scale_img:eq(" + i + ")");
        var s_width = parseInt(pict.attr("scale_w"));
        var s_height = parseInt(pict.attr("scale_h"));
        var s_rapporto = s_width / s_height;

        var p_width = pict.width();
        var p_height = pict.height();
        var p_rapporto = p_width / p_height;

        if (s_rapporto > p_rapporto) {
            pict.width("auto");
            pict.height(s_height);
        } else {
            pict.width(s_width);
            pict.height("auto");
        }
    }



});