我想制作导航系统，点击div更改

After loading the page when I'm clicking the events, aboutus or contact us nav, the javascript is working i.e the div is being shown (initially in css I've kept the display:none; for div with id home,events,aboutus,contactus).But when I want to come to home from events, aboutus or contactus the div is not changing back (its not showing).Please helpAfter loading the page when I'm clicking the ev