var vie= 
parseFloat(navigator.appVersion.slice(navigator.appVersion.indexOf("MSIE")+4,navigator.appVersion.length)); 
function sinmenu(){ 
	event.cancelBubble = true; 
	event.returnValue = false; 
	return false; 
} 
function noclicderecho(e){ 
	if (navigator.appName == 'Netscape' && (e.which == 3 || e.which == 2)) return false; 
	else if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2 || event.button == 3)){ 
		if (vie < 5){ // -- para el IE4 -- \\ 
			return false; 
		} else if (vie >= 5){ // -- para el IE5 -- \\ 
				document.oncontextmenu = sinmenu; 
				return false; 
		} 
	} 
	return true; 
} 
document.onmousedown=noclicderecho; 

// -- Desabilita el clic derecho en las capas (layers) -- \\ 

if (document.layers)window.captureEvents(Event.MOUSEDOWN); 
window.onmousedown=noclicderecho;