Perl form script returning blank entries

I run a simple perl guestbook form script that has been working perfectly for a few years. Lately, however, I’ve been getting a lot of blank submissions — so many, in fact, that I don’t think they are coming just from folks fooling around.

Previously I noticed that if a user used the “enter” key to move from one field line to the next, it would launch the program. So I added a java script to block the enter key and encourage the use of the tab key.

But I don’t think that’s the problem.Sometimes the form works just fine, and submissions come through as they should. But then I’ll get scores of blanks.

Has anyone experienced anything like this? I am wondering if it might be browser-related? Any ideas?