function _appendCommentToggle(welTr, welUl) {
            var welTd = $('<td colspan=3>')
                .data("line", welTr.data("line"))
                .data("side", welTr.data("side"))
                .data("path", welTr.data("path"));

            if (htVar.bCommentable) {
                var welCommentBoxToggleButton = htElement.welEmptyCommentButton.clone()
                    .text(Messages("code.openCommentBox"))
                    .attr('data-toggle','commentBoxToggle')
                    .attr('data-type','open');

                welUl.append(welCommentBoxToggleButton);
            }

            return $('<tr/>',{class:'comments board-comment-wrap'})
                    .append($('<td colspan="3">').append(welUl));
        }
@param {Object} welTr
@param {Object} welUl