$(document).ready(function() {

    $('.rollover_ov').each(function() {
        var srcOriginal = $(this).attr('src');
        var srcHover = null;
        if (srcOriginal != null) {
            var lastDot = srcOriginal.lastIndexOf(".");
            if ((lastDot != null) && (lastDot > 0)) {
                var urlWithoutExtension = srcOriginal.substring(0, lastDot);
                var extension = srcOriginal.substring(lastDot + 1);
                srcHover = urlWithoutExtension + "_ov." + extension;
            }
        }

        $(this).data({
            'srcOriginal': srcOriginal,
            'srcHover': srcHover
        });
    });

    $('.rollover_ov').hover(function() {
        var srcHover = $(this).data('srcHover');
        if (srcHover != null) {
            $(this).attr('src', srcHover);
        }
    },
        function() {
            if ($(this).hasClass('active') == false) {
                var srcOriginal = $(this).data('srcOriginal');
                if (srcOriginal != null) {
                    $(this).attr('src', srcOriginal);
                }
            }
        }
    );

    $('.rollover_ov.active').each(function() {
            var srcHover = $(this).data('srcHover');
            if (srcHover != null) {
                $(this).attr('src', srcHover);
            }
        });
   
    });