Contact.asp and Reducing Spam

Is there a way to record the time when the contact.asp form is loaded and when the form is submitted and calculate the difference in time between the two, and if the time difference is below a user defined amount (say 5 seconds), then the form would not be sent? I've been reading about implimenting some form of CAPTCHA functionality or some other alternative in an effort to eliminate as much spam as possible.

Thanks in advance.

Thanks Netprofits. The reason I even started thinking about this is that I began to think about the potential benefits of having something like what PC uses when people log into these forums, in an effort to stop unwanted information requests from being sent to our customer service department. Since we offer people a complimentary item if they request it using a form similar to the contact.asp page, I wanted to make sure that it was going to go to an actual person, not some non-existant entity.  So I checked out the PC forum login page source code and saw that PC uses Web Wiz Guide CAPTCHA http://www.webwizguide.com/webwizcaptcha/ and since I have no experience in this decided to start researching it online. There seems to be a lot of debate regarding using methods like CAPTCHA and that it can be problematic for people without excellent eyesight. One method I came across was the method of disallowing forms from being sent if the time difference between the loading and submitting of the form was too quick. Obviously it would take a person more than a few second to properly complete the form with the required information, and by setting a time constraint for form sumtittal would eliminate potential automated spammers since most of them complete forms within a second or two (from what I read online). Since I'm not a programmer I'm just going to have to poke around until I can get something working where the user doesn't even know it's happening, or just resort to using something like the CAPTCHA method.

Thanks again for pointing me in the right direction.

Greg,

After thinking about if for a while I think I'm just going to go with the captcha way. Would you be kind enough to help impliment this into the PC forms? I'm not exactly sure what the form handler is and how to tell it that if the code entered is incorrect, then what do you do?

Thanks in advance.

EDIT...Note to future readers: this message was submitted prior to looking at Greg's solution. Read my response after this one for more current information.

Thanks again Greg. I downloaded the free version just to try it out and I was able to place the form where I wanted in the Contact.asp file, as well as add a few new items to the languages.asp file for a title and description of the captcha. The problem I have now is that I tried to add the validation part of the code into sendmail.asp (the file that I think is the form handler) but I get a Microsoft VBScript compilation error, which turns out to be an issue with PC since I think the Contact.asp "submit" button is submitting to the same page that the captcha image is displayed on. There was a post on the Web Wiz forum about this issue, but not specifically relating to PC. If I understand how the Contact.asp page works; when the form is filled out and the "submit" button is clicked, the form fields are checked to make sure they're completed and if they are, the information in those fields are passed to the sendmail.asp file for e-mail submission, at the same time the PC Contact.asp page is reloading and displaying the "your message has been sent" message. All this programming code is a foreign language to me but I'll keep trying to decipher it. If anyone has successfully implemented the Web Wiz captcha system into PC, please lend some assistance. I greatly appreciate it.