Are you getting this?
You probably have Java disabled in Safari's Preferences > Security, which is a good defense against Java malware:
Personally, I recommend not enabling it and informing Target of your displeasure for their reliance upon Java for such a trivial task.
However, if you must print these coupons then enable Java in Safari Preferences, then quit Safari. Then, run Software Update which will probably offer the Java for OS X Lion 2012-003. Here is the direct link to the update: http://support.apple.com/kb/DL1515
If you are running Snow Leopard then the direct download link is: http://support.apple.com/kb/DL1516
Then, launch Safari and enable Java in Safari Preferences. You should be able to print the coupons.
After that I recommend disabling Java again.