$(document).ready(function(){
    $(".overslider").each(function() {
        var obj = $(this);
        var div = $('<div class="overslide" />');
        obj.css("position","relative");
        div.width(140).height(160).css({
            "overflow":"hidden"
        }).mousemove(function(e){
            //var alturat = obj.find('li').size()*18;
            var alturat = obj.height();
            var mouse = (e.pageY-obj.offset().top);
            var altura = div.height();
            var porcentaje = (mouse*100)/altura;
            var porcentajet = (mouse*100)/alturat;
            var top = (mouse-30) * (altura-alturat) / (alturat-60);
            if (((top+5) >= (alturat-altura)*-1) && (top <= 5)) {
                obj.css("top", top+"px");
            }
        });
        obj.wrap(div);
    });
});