This is intended as a security feature. You can get around
it by explicitly copying the Java programs to your local
disk, assuming that the programs theselves were written to
output their results. The browser's default is to trust
programs that reside on your disk. I think you can tell the
browser to trust other programs, but I'm not sure. Of
course, all this extra work partially negates the extreme
ease of use that one of Java's biggest charms Security and
ease-of-use seem to usually be in conflict.