I'm trying to add some funds and I want to use Double.parseDouble but, I don't think the page is recognizing double.parseDouble. I don't get an error but it won't add or pass the values.

Here is my code.

function CalculateBudget(){

    var table = document.getElementById('tblBudgetTotals');

    input1600 = 0;

    input1602 = 0;

    input1603 = 0;

    input1608 = 0;

    input1612 = 0;

    funding = 0;

    budgetSum = 0;



          input1600 = Double.parseDouble(document.getElementById('txt1600').value);

    input1602 = Double.parseDouble(document.getElementById('txt1602').value);

    input1603 = Double.parseDouble(document.getElementById('txt1603').value);

    input1608 = Double.parseDouble(document.getElementById('txt1608').value);

    input1612 = Double.parseDouble(document.getElementById('txt1612').value);

    funding = Double.parseDouble(document.getElementById('FundingTotals').value);



    budgetSum += Double.parseDouble(input1600) + Double.parseDouble(input1602) + Double.parseDouble(input1603) + Double.parseDouble(input1608) + Double.parseDouble(input1612) + Double.parseDouble(funding);



    document.getElementById('totbud').value = Double.parseDouble(budgetSum);

}