Place a PDF page in InDesign CS

I want to choose which page of a multiple page PDF I want to place on my InDesign page, so I use the PDF Place preference property in my script and it still doesn’t work (it keeps placing page 1!). I’m new to InDesign scripting. What am I doing wrong?
Thanks!

Here’s my script

tell application "InDesign CS" 
activate 
set mydoc to make document 
tell document preferences of mydoc 
set pdfproperties to {class:PDF place preference, page number:2} 
set page width to idw 
set page height to idh 
set pages per document to pagecount 
set mypdfpage to place mypdf with properties pdfproperties on page 1 of mydoc 
end tell 
end tell

Trimmed down a bit. The problem is that you need to set the page number of the pdf place preferences of Indesign to the page that you want to place for each page you need to place

set x to choose file

tell application "InDesign CS"
	activate
	set page number of PDF place preferences to 2

	tell document 1
		set mypdfpage to place x on page 1
	end tell
end tell