Photoshop TWAIN Import script

The ultimate goal is to use a sheet fed scanner and combine all the pages into a single pdf file. When using the Imagistics TWAIN in photoshop each page becomes a separate file, which is fine. I’ve got some other applescripts I’ve pieced togeather from various sources for combining the pdf’s but can’t get the applescript to launch the Imagistics TWAIN. The script below returns a “NSReceiverEvaluationScriptError: 4” Any suggestions? All I’m trying to get right now is for applescript to launch the TWAIN Import.
If you have any suggestions of other free programs, I’m open to ideas - I’ve played around with Image Capture and can not get it to work with the document feeder, it only seems to scan the first page.

tell application "Adobe Photoshop 7.0" to activate
tell application "System Events"
	tell process "Adobe Photoshop 7.0"
		tell menu bar 1
			click menu item "Imagistics TWAIN..." of menu "Import" of menu "File"
		end tell
	end tell
end tell

Try something like this, planetexpress:

tell application "Adobe Photoshop 7.0" to activate
tell application "System Events" to tell process "Adobe Photoshop 7.0"
	click menu item "Imagistics TWAIN..." of menu "Import" of menu item ¬
		"Import" of menu "File" of menu bar item "File" of menu bar 1
end tell