Thanks for the replies, guys.
Yes, I was already having doubts about the course. A number of the examples/exercises that have been presented so far haven't worked in one browser or another. This one has really pushed me to the edge, as it didn't work in either browser
I got the course (+ a six week Perl one) free though, since I was unemployed when I registered for them.
The material gives the impression that it has been updated repeatedly by different people, none of whom have read what's gone before, and none of whom have checked the code examples. For example, operator precedance has been covered three times
By comparison, other snippets of code in the examples aren't even mentioned in the explanatory text - so their significance isn't explained.
I've just ordered the O'Reilly book on Javascript from Amazon, and I'll start doing some of the online tutorials that are on the internet - I'm 100% sure that I'll get a better understanding of Javascript from that than from the course notes. I hope that the Perl course is better - I've still got to start that
Could either of you suggest a good online JavaScript course - my natural inclination is to head straight for the w3schools site - is that one that you would recommend?
Thanks again for the replies,
Don
P.S. I changed the code as you suggested Eric and it works a treat. I assume that the purpose of "return false" is to prevent the form refreshing? Mind you, I've now found that in FireFox, the Reload Page button fails to re-enable the three "answer" buttons - there's always something else