How do I keep a confirmation message from firing when changing a text city field, when the field is empty?

Check the jsp part...Fix your quotes around the onChange() handler and end of previous line perhaps?
Does the global zipLookupDone contain true? Proper quotes around the field names you are referring to in the elements array?

oops, the jsp should be as given below -

in the js i have defined

var zipLookupDone = "false";

but it gets overriden if there is already a value in the zip field

    if (contactInformationForm.elements[zipField].value.toString().length > 0)
    {
          zipLookupDone = "true";
    }

so when i load the page and the address is already filled in, ziplookupdone should be true.  but what my tester is telling me (i havent tried to test this yet), is taht even when the fields are all initially blank, the confirmation message is still firing when changing from empty field to entering a city name.  

Lets say you have: City:_____  and you change it to City: Beverly Hills
you get "Do you want to...yes or no"

That shouldn't happen if the field is blank.  Only if its City: San Diego and you change it to City: Los Angeles

                    <cf-el:text 
                    	property="property(city)" 
                    	onblur="isAlphaWithSpacesOnly(this);javascript:checkCityStateZip(this);checkCity(this);" 
                    	onchange="setChanged();"
                       	errorId="property(addressId)"/>

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with if ((contactInformationForm.elements[priorCityField].value.length != 0) && priorCity != currentCity)
if the initial value of the field is "phoenix" and i erase it, confirm, then change the blank field to "calexico" it wont fire.  this is good.  but then if i change it again from calexico to "prescott" it wont fire.  

i also tried if (((priorCity != null) || (priorCity != "")) & priorCity != currentCity)
and that didnt have any affect whatsoever from just using priorCity != currentCity alone

thanks for your help, that got me on the right track.  i ended up with  the following - which works!

function checkCity(field)
{
        //isAlphaWithSpacesOnly(field);
        var priorCity = contactInformationForm.elements[priorCityField].value;
        var currentCity = contactInformationForm.elements[cityField].value;  
 
    if (isAlphaWithSpacesOnly(field))
    {
     if (priorCity != 0) 
     {
      if (zipLookupDone == "true")
      {
  
        if (priorCity != currentCity)
        {
            if (!confirm("Should the CITY be changed from " + priorCity + " to " + currentCity + "?"))
            {
                contactInformationForm.elements[cityField].value = priorCity;
            }
            else
            {
             contactInformationForm.elements[priorCityField].value = currentCity;
            }
        }
      }
    }
     else
     {
     contactInformationForm.elements[priorCityField].value = currentCity;
     }
   }
   else
   {
   return false;
   }   
}

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thanks, that got me on the right track.  i ended up w/ the following, which works.

function checkCity(field)
{
        //isAlphaWithSpacesOnly(field);
        var priorCity = contactInformationForm.elements[priorCityField].value;
        var currentCity = contactInformationForm.elements[cityField].value;  

    if (isAlphaWithSpacesOnly(field))
    {
     if (priorCity != 0)
     {
      if (zipLookupDone == "true")
      {
 
        if (priorCity != currentCity)
        {
            if (!confirm("Should the CITY be changed from " + priorCity + " to " + currentCity + "?"))
            {
                contactInformationForm.elements[cityField].value = priorCity;
            }
            else
            {
             contactInformationForm.elements[priorCityField].value = currentCity;
            }
        }
      }
    }
     else
     {
     contactInformationForm.elements[priorCityField].value = currentCity;
     }
   }
   else
   {
   return false;
   }  
}