JSesh 2.13.3 doesn't run on Mac OS X tiger (corrigé)

I have accidentally used features of java 1.6 in the latest version of JSesh. Mac OS X tiger (and of course leopard) doesn't support this version of Java. I will fix it, but let's say that it's a bit difficult to remain polite considering Apple's policy for java version. Java 1.5 could still be installed on Windows 98... Java 1.6 can't run on a two years-old Mac.