Someone

document.oncontextmenu = function(e)
{
	if ( isDOM && e.target.form == undefined )
	{
		e.stopPropagation();
		e.preventDefault();
		return( false );
	} else if ( !isDOM && event.srcElement.form == undefined ) {
		event.cancelBubble = true;
		event.returnValue = false;
		return( false );
	}
}