How to convert amount entered in digits with decimal points to words in javascript?

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How to convert amount entered in digits with decimal points to words in javascript?

My current code is as below:

function number2text(value) {
    var fraction = Math.round(frac(value)*100);
    var f_text  = "";

    if(fraction > 0) {
        f_text = "AND "+Number(fraction);
    }

    return Number(value)+" "+f_text;
}
function frac(f) {
    return f % 1;
}

function Number(number)
{
    if ((number < 0) || (number > 999999999))
    {
        return "NUMBER OUT OF RANGE!";
    }
    var Gn = Math.floor(number / 10000000);  /* Crore */
    number -= Gn * 10000000;

    var kn = Math.floor(number / 100000);     /* lakhs */
    number -= kn * 100000;

    var Hn = Math.floor(number / 1000);      /* thousand */
    number -= Hn * 1000;
    var Dn = Math.floor(number / 100);       /* Tens (deca) */
    number = number % 100;               /* Ones */
    var tn= Math.floor(number / 10);
    var one=Math.floor(number % 10);
    var res = "";

    if (Gn>0)
    {
        res += (Number(Gn) + " CRORE");
    }
    if (kn>0)
    {
            res += (((res=="") ? "" : " ") +
            Number(kn) + " LAKH");
    }
    if (Hn>0)
    {
        res += (((res=="") ? "" : " ") +
            Number(Hn) + " THOUSAND");
    }

    if (Dn)
    {
        res += (((res=="") ? "" : " ") +
            Number(Dn) + " HUNDRED");
    }


    var ones = Array("", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX","SEVEN", "EIGHT", "NINE", "TEN", "ELEVEN", "TWELVE", "THIRTEEN","FOURTEEN", "FIFTEEN", "SIXTEEN", "SEVENTEEN", "EIGHTEEN","NINETEEN");
var tens = Array("", "", "TWENTY", "THIRTY", "FOURTY", "FIFTY", "SIXTY","SEVENTY", "EIGHTY", "NINETY");

    if (tn>0 || one>0)
    {
        if (!(res==""))
        {
            res += " AND ";
        }
        if (tn < 2)
        {
            res += ones[tn * 10 + one];
        }
        else
        {

            res += tens[tn];
            if (one>0)
            {
                res += (" " + ones[one]);
            }
        }
    }

    if (res=="")
    {
        res = "ZERO";
    }
    return res;
}
function number2text(value) {
    var fraction = Math.round(frac(value)*100);
    var f_text  = "";

    if(fraction > 0) {
        f_text = "AND "+Number(fraction);
    }

    return Number(value)+" "+f_text;
}
function frac(f) {
    return f % 1;
}

function Number(number)
{
    if ((number < 0) || (number > 999999999))
    {
        return "NUMBER OUT OF RANGE!";
    }
    var Gn = Math.floor(number / 10000000);  /* Crore */
    number -= Gn * 10000000;

    var kn = Math.floor(number / 100000);     /* lakhs */
    number -= kn * 100000;

    var Hn = Math.floor(number / 1000);      /* thousand */
    number -= Hn * 1000;
    var Dn = Math.floor(number / 100);       /* Tens (deca) */
    number = number % 100;               /* Ones */
    var tn= Math.floor(number / 10);
    var one=Math.floor(number % 10);
    var res = "";

    if (Gn>0)
    {
        res += (Number(Gn) + " CRORE");
    }
    if (kn>0)
    {
            res += (((res=="") ? "" : " ") +
            Number(kn) + " LAKH");
    }
    if (Hn>0)
    {
        res += (((res=="") ? "" : " ") +
            Number(Hn) + " THOUSAND");
    }

    if (Dn)
    {
        res += (((res=="") ? "" : " ") +
            Number(Dn) + " HUNDRED");
    }


    var ones = Array("", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX","SEVEN", "EIGHT", "NINE", "TEN", "ELEVEN", "TWELVE", "THIRTEEN","FOURTEEN", "FIFTEEN", "SIXTEEN", "SEVENTEEN", "EIGHTEEN","NINETEEN");
var tens = Array("", "", "TWENTY", "THIRTY", "FOURTY", "FIFTY", "SIXTY","SEVENTY", "EIGHTY", "NINETY");

    if (tn>0 || one>0)
    {
        if (!(res==""))
        {
            res += " AND ";
        }
        if (tn < 2)
        {
            res += ones[tn * 10 + one];
        }
        else
        {

            res += tens[tn];
            if (one>0)
            {
                res += (" " + ones[one]);
            }
        }
    }



    //app.alert(res);
    return res;
}


if (this.getField("rdoGpAmountType").value == "Debit")
{
 if(event.value!="")
{
 if(event.value=="0")
 {
  this.getField("txtAmountInWords").value = "ZERO ONLY";
 }
 else
{
this.getField("txtAmountInWords").value = number2text(this.getField
 ("txtDebitAmount").value)+" "+"ONLY";

}


}

else
{
 this.getField("txtAmountInWords").value="";
}
}