hi moray simon,
Actually there is something you can do about this. Go to this site and download and exectute JavaRa. This program will remove all old/older versions of java from your system.
http://singularlabs.com/software/javara/ Helpful when you have an older version that just won’t leave.
@ -midnight
Try the above and see if you can get that message to go away. I’d never choose ignore, but would instead fix the problem. This tool may just do the trick for you.
FYI: I do not run java in any form due to security risks. [EDIT:] java is not javascript which is used in your web browser application. If java is not needed, uninstall it and be rid of java related malware.