How To Embed Engage Behind A Dropdown Menu? What Code Please?

An example of the dropdown menu can be seen here: "http://www.onlineenglishteacher.com/menu-for-students-learning-english/english-classes-by-skype/skype-english-lesson-syllabus" (may get deleted etc. when resolved) - also messaging the menu owner for any tips - want the menu to cover the Engage embed - please give specific code instructions such as how to change the z-index - file with code attached - thank you.