InDesign Applescript Resizing Placed Images - resize

Question

Please explain how to make applescript understand I want to select all images on the active page (which in my case are going to be one), to resize the image and fit frame to content.
tell application "Adobe InDesign CS6"
set myPagecount to count pages of active document
repeat with i from 1 to myPagecount
set thisImage to select every graphic frame of page i
tell content of thisImage
set height to "11in"
set width to "8.5in"
fit given frame to content
end tell
end repeat
end tell
This obviously doesn't work...
Thanks!

Answer 1

Just to give you some ideas:
tell application "Adobe InDesign CS5.5"
activate
set myPagecount to count pages of active document
tell active document
set myPage to page 1
tell page myPage
tell item 1 of all graphics of myPage
set geometric bounds of it to {10, 10, 0, 0}
end tell
end tell
end tell
end tell
Just reference your page and loop through the collection of all graphics. You will need to change values for geometric bounds, use quotation marks for inches ("8.5in").
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Edited:
The code above actually resizes graphics/pdf inside the frame. I added 2 versions - one for the pdf and one for the frame. You need to set your values in geometric bounds
tell application "Adobe InDesign CS6"
activate
set myPagecount to count pages of active document
tell active document
set myPage to page 1
tell page myPage
tell item 1 of all graphics of myPage
set geometric bounds of it to {100, 100, 0, 0}
end tell
tell text frame 1 of myPage
set geometric bounds of it to {100, 100, 0, 0}
end tell
end tell
end tell
end tell

Answer 2

This is the final answer - thanks to nicolai.kant!
tell application "Adobe InDesign CS6"
set myPagecount to count pages of active document
tell active document
repeat with i from 1 to myPagecount
set myPage to page i
tell page myPage
tell item 1 of all graphics of myPage
set geometric bounds of it to {"8.5in", "11in", 0, 0}
fit given frame to content
end tell
end tell
end repeat
end tell
end tell