function menu()
{
document.getElementById("menu").style.visibility = 'visible';
document.getElementById("menu").style.top = event.clientY + document.body.scrollTop;
document.getElementById("menu").style.left = event.clientX + document.body.scrollLeft;
return(false);
}
function finish()
{
document.getElementById("menu").style.visibility = 'hidden';
}
document.oncontextmenu=menu;
document.onmouseup=finish;