How do I filter by file type in Applescript?

Hi
I have put together this AppleScript which opens the folder of the currently playing track in iTunes in icon view. The one thing I'd like to do which I can't work out is to filter by file type. I'd like to just have images/jpgs show in the resulting finder window. Could someone help me out with this?
Thanks
Nick
tell application "iTunes"
if player state is not stopped and class of current track is file track then
set loc to location of current track
tell application "Finder"
reveal loc
activate
set curFolder to (Finder window 1)
set bounds of Finder window 1 to {50, 30, 1870, 1140}
tell curFolder
set current view to icon view
set arrangement of its icon view options to arranged by name
set icon size of its icon view options to 290
end tell
end tell
end if
end tell

OK. Thanks. I can live with finding the JPGs myself. Because they are usually the first files listed when sorted by filename, is there a way of getting the finder window to scroll to the top with Applescript. With the current script it is scrolling to where the currently playing file is.

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Export_file_types.png ‏28 KB

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How do I filter by file type in Applescript?

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