Disabling onclick attribute with javascript

Question

How do I disable the other onclick event once one of them has been activated. Both divs are set to display:none; in the CSS. This is probably really simple but I am new to p

Answer 1

this should do the trick:

function showDiv(id)
{   
  if(id == "leftbutton"){
     document.getElementById('orangediv').style.display = 'block';
     document.getElementById('righttbutton').onclick = null;
     }else{
     document.getElementById('greendiv').style.display = 'block';
     document.getElementById('leftbutton').onclick = null;
}}