javaScript mouse right button clicked

event.which

by codeSpy

HTML

<div onmousedown="showEditButton(event);">Row Content</div> <button id="editButton" style="display:none;">Edit</button>

JavaScript

function showEditButton(event){
    event = event || window.event;
    if(event.which == 3){
        var button = document.getElementById("editButton");
        button.style.display = 'block';        
    }
}