function OpenWindow(Adress, my_left, my_top, my_width, my_height)
{
	var _width = 0, _height = 0, centered_width = 0, centered_height = 0;
	if (!my_width){ my_width=650; }
	if (!my_height){ my_height=400; }
	_width = screen.availWidth;
	_height = screen.availHeight;
	if (_width>my_width) centered_width = (_width-my_width)/2;
	if (_height>my_height) centered_height = (_height-my_height)/2;
	if (!my_left){ my_left=centered_width; }
	if (!my_top){ my_top=centered_height; }
	return open(Adress, "", "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=no,top="+my_top+",left="+my_left+",width="+my_width+",height="+my_height);
}