thank you for you reply. i think the reason is as you pointed out. my enviroment:　windowsXP sp3 + IE8

Still I think it is easier to adapt (i.e. scale) the curves than perform the 'pen trick' (since you require the pen writing also oblique lines). :) If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile. This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke [My articles]