One version of the <cf_formURL2attrbutes> tag has this option built in.
I'll copy paste the code from it, should be quite self explaining:

<!--- This is so that you can have multiple type="image" buttons
      on the same page, if you name the button
      name="fuseaction_[the value you want]" it will set the
      fuseaction to that value --->
<cfif findnocase("fuseaction_",field) and findnocase(".x",field)>
   <cfset setfuseaction=replacenocase(field,"fuseaction_","")>
   <cfset setfuseaction=replacenocase(setfuseaction,".x","")>
   <cfif refind("[0-9]",setfuseaction)>
      <!--- This is so you can associate an "ID" with an image
            button (optional) like this:
            <INPUT type="Image"
                   src="/IMAGES/MYIMAGE.GIF"
                   NAME="fuseaction_addthisaddress56">
            it would return ID=56 That way you can a bunch of
            image buttons in the same form that do the same thing
            but each one has an ID associated with it. --->
      <cfset
thisid=val(mid(setfuseaction,refind("[0-9]",setfuseaction),len(setfuseacti
on)))>
      <cfif thisid>
         <cfset caller.ID=thisid>
      </cfif>
   </cfif>
</cfif>

--
Erki

----- Original Message -----
From: "Ken Beard" <[EMAIL PROTECTED]>
To: "Fusebox" <[EMAIL PROTECTED]>
Sent: Wednesday, March 21, 2001 3:35 AM
Subject: RE: image button navigation


> sounds great, but the type="image" doesn't seem to have a value
> attribute.  the only values that get passed through are
> fuseaction.x=56 and fuseaction.y=102 which are the x/y coordinates
> of the pixel you clicked on within the image.



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