mount "damaged" disk image in shellscript on 10.4

[Chad Leigh -- ObjectWerks]

I am trying to write a shell script on a 10.4 system that uses  
hdiutil to mount a disk image at system boot time.

I have some games that require a CD to be mounted to run.  These are  
for my 5 year old boy.  His iBook (gen 1 iceBook hand me down from  
me)  has a busted   CD drive and I have made disk images of the CDs.   
(They are some hybrid windows/mac disks).  When mount them using  
hdiutil it comes up with

The disk image you are opening may be damaged and could damage your  
system.
Are you sure you want to open this disk image? (Y/N)

If you say Y then they mount normally.  They are not really damaged  
by the system gives you this message due to the hybrid nature (I have  
multiple games with the same "problem" with the images and they all  
work fine if you answer yes.  Mounting from the Finder gives you a  
similar dialog box.

What I need to do is to auto answer this with Y in the script so that  
no user intervention is required.   Nothing I have tried works

hdiutil attach my-image.dmg <<EOF
Y
EOF

echo "Y" |  hdiutil attach my-image.dmg

hdiutil attach my-image.dmg < answer

where answer is a file with Y

Anyone have any other ideas on how to feed responses programatically  
to hdiutil?

Thanks
Chad