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JavaScript and <html:text> in FireFox

Please be gentle - I'm not a developer, just trying to fix something the original developer wrote.

I have a Java application that is displaying a set data entry fields using <html:text>; each field has JavaScript associated with it for some automatic calculations and to automatically changing the text color under certain conditions.

However, the JavaScript does not run in FireFox, while it does run in IE.  Here is the error received:
      document.getElementById(propPrefix + "cActual") has no properties

After some research, I believe the reason is because the <html:text> which defines the field does not have an ID for the JavaScript to reference (I found somewhere that IE will reference a field by Name, but FF requires the ID).

When I add an ID tag to the <html:text> field I get this error when the screen attempts to display:
      Attribute id invalid for tag text according to TLD

So, is there some way to add an ID to the <html:text> field, or some other resolution to my problem?  Thanks for any help you can provide.  Copies of the relevant field and JavaScript lines are just below.

      <html:text property="<%= propertyPrefix + "cActual" %>" size="6" maxlength="10"
        onblur="<%= onBlur + " setAsFoundAsLeftFromActual(" + jobFuncReadingIndex + ");" %>"
        onchange="<%= "setReadingDataChangedState('" + jobFuncReadingIndex + "', 'cActual');
        calcDevFromAct(" + jobFuncReadingIndex + ");
        form.elements['" + propertyPrefix + "cDeviation'].value = formatNumber(form.elements['" + propertyPrefix +  
        "cDeviation'].value, '0.' + getDecimalPattern(form.elements['" + propertyPrefix + "nDecimals'].value));
        checkToleranceActual(" + jobFuncReadingIndex + ");" %>"/>

           if (document.getElementById("cActual").value != "" && isNaN(document.getElementById("cActual").value) == false) {
         document.getElementById("cActual").value =
         formatNumber(document.getElementById("cActual").value, "0." + getDecimalPattern(nDecimals));
         document.getElementById("cActual_dirty").value = true;
     } // if (document.getElementById("cActual").value != "" && ...)
1 Solution
what is the value of propertyPrefix / propPrefix?

i don't see any name= or id= in your code. javascript has 2 similar functions, getElementById and getElementByName that search based on the id and name, respectively. if an element does not have an id or name, the searches will not work.

try changing:
<html:text property="<%= propertyPrefix + "cActual" %>"
<html:text property="<%= propertyPrefix + "cActual" %>" id="<%=propertyPrefix + "cActual" %>"
ajravenAuthor Commented:
Thanks for the response, netmunky.
I suspected the problem was a lack of an "id" tag.
That definitely set me in the right direction.

However, for those who may have a similar problem in the future:
I forgot to mention that we're using the Struts development environment; in Struts, the tag "id" is not supported for html:text.
Turns out the Struts version is "StyleId".
Changing the line to read:
<html:text property="<%= propertyPrefix + "cActual" %>" StyleId="<%=propertyPrefix + "cActual" %>" />

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