if ($(inEvent.target).hasClass('addr')) {
        if ($(inEvent.target).hasClass('history')) {
            var idx = inEvent.target.className.split(' ').filter(function(x) { return x.substr(0, 'history_idx_'.length) == 'history_idx_'; });
            idx = String(idx).split('_')[2];
            r2ui.history_idx = idx;