function keydown( e )
{
	if( event.ctrlKey == true ) return false;
	if( event.shiftKey == true ) return false;
	if( event.keyCode == 116 ) {
		event.keyCode = 0;
		event.cancelBubble = true;
		event.returnValue = false;
	}
	return true;
}
function no_dragging()
{
	return false;
}
//document.onkeydown      = keydown;
//document.ondragstart    = no_dragging;
//document.onselectstart  = no_dragging;
//document.onmovestart    = no_dragging;
//document.oncontextmenu  = no_dragging;