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

Just set the onclick property of the other element to null;

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;
    }
}