codice:
function ApriMenuTxDx(e){
	var menu = document.getElementById("MenuTxDx");
	e=e||event;
	var vDoc=(document.documentElement.clientWidth)?document.documentElement:document.body;
	menu.style.top = ((window.pageYOffset?window.pageYOffset:vDoc.scrollTop)+e.clientY)+'px';
	menu.style.left = ((window.pageXOffset?window.pageXOffset:vDoc.scrollLeft)+e.clientX)+'px';
	menu.style.visibility = "visible";
}
codice:
<body oncontextmenu="ApriMenuTxDx(event); return false;" onclick="ChiudiMenuTxDx()">