[OS X TeX] How to split horizontally the PDF preview in TeXshop

[Vincent Verfaille]

On 8-Oct-09, at 8:47 AM, Thomas Rike wrote:

> Go to Preview menu, select Display Format, then select Double Page.

Well, I was not clear enoug.
What I am looking for is a horizontal split that allows to display non- 
following pages side-by-side.
Which means, for instance, to see page 10 on the left, and page 123 on  
the right...

Any clue?

Thanks in advance,

Vincent