if (!$('#course-detail-modal').is(':visible')) { window.modalStack = []; } $('#course-detail-modal').modal('hide'); $('#course-detail-modal').remove(); window.modalStack.push({ 'title': 'ENG 335', 'url': '/zapps/CourseCatalog/CourseDetail/2020/010?CoursePrefix=ENG&CourseNumber=335' }); $('body').append('