Customize Upload.aspx for Document Libraries

Hi Experts, is it possible to customize the Upload.aspx from a Document Library?

I did so with SharePoint Designer while opening my Library/Forms/Upload.aspx.

I attached a different Masterpage, saved it, which looks good in the Designer, but when i click the Upload-Button in the Library, the Browser opens the Upload.aspx from the _layouts - Folder.

So what for the Upload.aspx-Page is in the Forms-Folder in my Library then?

In some blogs i read -- not supported -- or -- customize the Upload.aspx from your Site-Definition --

Is that true?

Any ideas?

Thanx

Ronny

[620 byte] By [RonnyLewandowski] at [2007-12-30]