I had another look at the script and was able to get it updated to function. The problem was with the way form fields are accessed. I don't remember what the option is called, but when it is turned off, http post data has to be accessed through $_POST not through global variables. I changed $field to $_POST['field'] in several places and it seems to be working.

I gave it a VG rating, as previously when I had it working it did an admirable job. I just moved it to a new server and with php 5.3.17 it no longer works?!