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

Something along these lines:

function showDiv(id){   
var o = document.getElementById('orangediv');
var g = document.getElementById('greendiv');
if  (id == "leftbutton"){
     o.style.display = 'block';
}else{
    g.style.display = 'block';
}
o.writeAttribute('onclick','');
g.writeAttribute('onclick','');
}