function addSpan(text) {
    if (text.search(/.*\(.*\).*/) != -1) {
        return(text.replace(/(.*)(\(.*\))(.*)/, '$1<span class="zavorka">$2</span>$3'));
    } else {
        return(text);
    }
}

$(document).ready(function() {
    $('#scrollbox>ul>li').addClass('polozka');
    $('#scrollbox h4').addClass('vino');
    $('#scrollbox>ul>li>ul>li:first-child').addClass('english'); //.css({'font-weight':'bold','color':'blue'});
    $('#scrollbox>ul>li>ul>li.english + li').addClass('hmotnost');
    $('#scrollbox>ul>li>ul>li.hmotnost + li').addClass('cena');
    $('#scrollbox>ul>li>ul>li.cena + li').addClass('novinka');
    elms = $("#scrollbox li.polozka");
    jQuery.each(elms, function() {$(this).html(addSpan($(this).html()))});
    elms = $("#scrollbox li.english");
    jQuery.each(elms, function() {$(this).html(addSpan($(this).html()))});
});