[JS] Hide/Show divs

I can hide and show a div fine. The problem arises when I want it to hide other div that I opened before it.

var openDiv=""; 
function toggleDiv(divid){
    if(document.getElementById(divid).style.display == 'none'){ 
      if(openDiv != ""){
          document.getElementById(openDiv).style.display = 'none';
       document.getElementById(divid).style.display = 'block';
      var openDiv = divid;
      document.getElementById(divid).style.display = 'none';

There’s the code I am trying to get it to work but it just seems to break. Any help or tips would be much appreciated.