common dialog in dhtml

I'm trying to use the common dialog control in a dhtml page, so that a user can select a location for the file. I used the following
dim x
set x = CreateObject("mscomdlg:commondialog")
x.showopen

The common dialog failed during initialization.

But if I change showopen to showprinter, it does show the printer box.

Could someone please direct me to what might be causing my problem.

As always, any help is greatly appreciated.

Thank you.

I use a different approach:
place an object tag on your html ´page:
<object id="d" classid="clsid:F9043C85-F6F2-101A-A3C9-08002B2F49FB">
</object>


then, when you want to show the open dialog:
document.all.d.showopen