detect toolbar changes ...

[tyris]

is there a way to detect a change in the toolbar ?
i mean, i have a window that is 350x500.
i need the page to be centered, so that the person don't need the scroll bar...
when the person changes the toolbar, i can become more large, so that my page is no more centered ...
is there a way to detect this in order to give back to my window the good size ?

thanks

elise Best regards,
Elise