[Javascript] newbie function question

[javascript@xxxxxxxxxx (Matthew Collins)]

hi all,

i'm trying to write a function to validate a form.  problem is, i want the
function to be reusable on many pages, so one of the variables passed to the
function is the form name, while the other variable is the name of the
fields to be checked.

problem is, i'm getting an error that the "'document.FormName.formArray'
does not exist"

here's the javascript:

<script language="JavaScript">

<!--
function IsFormComplete(FormName,formFields)
{
var x       = 0
var formArray = formFields.split(",");

for (x=0; x < formArray.length; x++)
   {
	if (document.FormName.formArray[x].value == '')
     {
        alert('Please enter the '+document.FormName.formArray[x].name +' and
try again.')
        document.FormName.formArray[x].focus()
     }
   }
}
// -->

</script>

*and the html of the form*
<form method="POST" action="formTest.asp" name="form"
onsubmit="IsFormComplete('form','T1,S1,C1');">


thanks in advance,