macOS Applescript / image mounting help

[jdr999]

I'm trying to create a script to open disk images, change the screen resolution, run an application, then eject the images and reset the desktop resolution.

I don't know why but I can't this to work reliably. Anyone have any ideas?

property myPath : "Macintosh HD:Users:Shared:Disk Images:"
property myApp : myPath & "Reader Rabbit Storybook"
property myTask : "TLClauncher"

property diskname1 : "RRERLS Disk1"
property diskISO1 : myPath & "Reader Rabbit Storybook.iso"

property diskname2 : ""
property diskISO2 : ""

on idle
	tell application "System Events" to set myProcesses to (name of every process)
	if myTask is not in myProcesses then
		tell application "Finder"
			if exists (disk diskname1) then eject diskname1
			if not (diskname2 = "") then
				if exists (disk diskname2) then eject diskname2
			end if
		end tell
		do shell script "cscreen -x 1920 -y 1200 -r 60"
		tell me to quit
	end if
	return 2
end idle

on run
	tell application "Finder"
		
		if not (exists the disk diskname1) then
			do shell script ("hdiutil attach " & quoted form of ¬
				POSIX path of (diskISO1 as string) & " -mount required -noverify")
			repeat until name of every disk contains diskname1
				delay 1
			end repeat
		end if
		
		if not (diskname2 = "") then
			if not (exists the disk diskname2) then
				do shell script ("hdiutil attach " & quoted form of ¬
					POSIX path of (diskISO2 as string) & " -mount required -noverify")
				repeat until name of every disk contains diskname2
					delay 1
				end repeat
			end if
		end if
		
	end tell
	
	do shell script "cscreen -x 640 -y 480 -r 60"
	tell application myApp to activate
	idle
end run