How do I get my taskbar and menubar to reappear when I have internet explorer open?

My daughter hit some keys on our laptop and now when we have internet explorer open, it doesn't show the tool bars? One acts like it is invisible but when I right click on the bar, it doesn't have a check next to invisible? Also, my internet explorer window takes up my whole computer screen. I am quite annoyed so I would appreciate any advice so I can go about my day. :)