if (window.Event)
document.captureEvents(Event.MOUSEUP); 
function nocontextmenu() {
event.cancelBubble = true
event.returnValue = false;
return false;} function norightclick(e) 
{if (window.Event) {if (e.which == 2 || e.which == 3)
return false;} else if (event.button == 2 || event.button == 3){
event.cancelBubble = true
event.returnValue = false;
return false;}}
document.oncontextmenu = nocontextmenu;
document.onmousedown = norightclick;