Is it possible to keep the UI Dialog box fixed in the middle of the screen ?

Is it possible to keep the UI Dialog box fixed in the middle of the screen ?


Hello,
I tried many way to resolve this problem and keep my dialog box in the
middle of the screen, even when using the main vertical scrollbar from
the navigator but I didn't find any way.
I tried to set the "position:fixed" attibute in the CSS for ui-dialog-
container but it has no effect.
I also would like to know if there is a way to close the dialog box
when we click outside.
Sorry if answers to theses questions were already on the forum, but I
didn't found them.
I also notice a bug in IE7 when resizing the dialog-box after the use
of a vertical scrollbar. The box jump down to another place. I think
that it's a bug, it's possible to see it on the jquery-ui website.
Thanks in advance for your help !
Cordially,
Andar