function _createLabel(sInstanceId, sName) {
            // If someone clicks a delete button, remove the tag which contains
            // the button, and also hide its category in .project-info div if
            // the category becomes to have no tag.
            var fOnLoadAfterDeleteLabel = function() {
                var welCategory = welLabel.parent().parent();
                var sCategory = welCategory.data('category');
                welLabel.remove();
                if (welCategory.children('.label-list').children().length == 0
                    && isRequired(sCategory)
                    && htElement.welInputLabel.data('category') != sCategory) {
                    delete htElement.htCategory[sCategory];
                    welCategory.remove();
                }
            };

            var fOnClickDelete = function() {
                $yobi.sendForm({
                    "sURL"   : htVar.sURLProjectLabels + '/' + sInstanceId,
                    "htData" : {"_method":"DELETE"},
                    "fOnLoad": fOnLoadAfterDeleteLabel
                });
            };

            var welDeleteButton = $('#label-delete-button-template')
                .tmpl()
                .click(fOnClickDelete);

            var welLabel = $('#label-template')
                .tmpl({'name': sName})
                .append(welDeleteButton);

            welLabel.setRemovability = function(bFlag) {
                if (bFlag === true) {
                    welLabel.addClass('label');
                    welDeleteButton.show();
                } else {
                    welLabel.removeClass('label');
                    welDeleteButton.hide();
                }
            }

            htElement.aLabel.push(welLabel);

            return welLabel;
        }
Make a tag element by given instance id and name.)

@param {String} sInstanceId
@param {String} sName