Error on posting of form

Hi Guys....I'm pretty new to coldfusion so I imagine this question will a piece of cake for some of you.  Here goes.

I have a form that processes orders and ultimately sends by coldfusion email.  I have a radio box <input type="radio" name="enable" value="agree">

When I send the form without checking the radio box it does not send and gives me the following error....

enable: #enable#
Name: #name#
Company: #company#
Address: #address#
Tel: #tel#
Email: #email#
Card Type: #card_type#
Name on card: #name_on_card#
Expiry: #expiry#
Card Number: #card_number#
Switch Issue Number: #switch_issue_number#
"

Error resolving parameter ENABLE

ColdFusion was unable to determine the value of the parameter. This problem is very likely due to the fact that either:

You have misspelled the parameter name, or
You have not specified a QUERY attribute for a CFOUTPUT, CFMAIL, or CFTABLE tag.

I'm not sure if the problem lies with coldfusion but wondered if you could advise?  Thanks!
aspguru28Asked:
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shooksmCommented:
The problem is on the Cold Fusion side.  Because HTML does not pass values for unused radio buttons, the ENABLE variable is not available to Cold Fusion.  You have a couple of choices.  You can use the IsDefined function to check to see if it exists before trying to use it, IE:

enable: <cfif IsDefined("enable")>#enable#<cfelse>disagree</cfif>

Or you can use the CFPARAM tag to define a default value for the parameter:

<cfparam default="disagree" name="enable">
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shooksmCommented:
I should mention that the cfparam needs to exist before you try to use the ENABLE parameter.
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aspguru28Author Commented:
I got a complilation error....not sure if I've constructed this correctly.  I don't have the option to use coldfusion in the action form only the page it posts to.

<cfparam default="disagree" name="enable">
enable: <cfif IsDefined("enable")>#enable#<cfelse>disagree</cfif>
Name: #name#
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shooksmCommented:
Put the CFPARAM tag before your CFMAIL tag and you shouldn't need the CFIF tag so you should be able to just use:

enable: #enable#
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aspguru28Author Commented:
yup I put the CFPARAM tag at the top of the page and bingo.....it works.  Thanks ever so much!
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