As I thought; there are several possibilities here:
1. Double-clicking a submit button only works on older browsers, which I don't use anymore, or perhaps machines with much slower processors (486?)
2. You are using some other method than a standard submit button to submit your form.
3. Maybe this happens with <FORM METHOD="GET" which I havent' tested yet
4. Your form handler itself has a glitch.
5. Your form handler is actually the same page that submitted the form, without redirecting to a "Thank you" message, thus what is actually happening is people are actually reloading the form and the second click is hitting the refreshed page.
6. Or, the most likely possibility... people are refreshing the page that handles the form, thus processing the form request all over again. Most modern browsers warn you if you are resubmitting a form, but maybe some users ignore it, or their browser doesn't warn them. [sig][/sig]