FORM API / Java script Error

System

Hi.
Env Win 2k with TS 6.5

i have the follwoing code of FormAPI which is working perfectly on TS 6.5 but when i am trying on TS 6.1 it fails due to many different errors. can someone Address this , where is the problem.

function init(){
IWEventRegistry.addItemHandler("/sub/paragraph","onItemChange",handle_para_change);
}
function handle_para_change() {

var summaryWordCount = 0;
var summaryDesiredWords = 3;
var summaryText="";

var paraParent = IWDatacapture.getItem("/sub");
var paras = paraParent.getChildren();
var paraCount = paras.length;

alert ("Total number of paragraphs:" + paraCount);
for (j=1; j<=paraCount; j++)
{
alert ("value of j : " + j);
paraItem = IWDatacapture.getItem("/sub[" + j + "]/paragraph");
paraText = paraItem.getValue();

alert("Para Text is: " + paraText );

if (( summaryWordCount == summaryDesiredWords) || (paraText==""))
{
alert ("Either Word Count " + summaryDesiredWords + " or No text in the Para..breaking");
break;
}


var summaryTextArray = paraText.match(/\w+/g);
alert("Summary text is:" + summaryTextArray);

for(i=0; ((i<summaryTextArray.length) && (summaryWordCount<summaryDesiredWords)); ++summaryWordCount, i++)
{
alert ("summaryWordCount : " + summaryWordCount);
summaryText = summaryText + " " + summaryTextArray;
alert("summaryTextArray[" + i + "] = " + summaryTextArray);

}

alert ("summaryText :" + summaryText);
}

alert ("setting summaryText as:" + summaryText);
summaryItem = IWDatacapture.getItem("/summary");
summaryItem.setValue(summaryText);
}
IWEventRegistry.addFormHandler("onFormInit",init);

I gone through the FormAPI TS 5.5.2 and 6.1. all the functions which i used in my code is available in API.

Thanks
RG