JavaScript and decimal separator

When calculating something in JavaScript or parsing text into a numeric value "," separator is a problem. Because, decimal separator is "." in JavaScript.
For example, you receive JSON data from server and all decimal numbers are received with "," separator because of server/user settings or programming language.

when i call the following js function:

    function calculate() {
        var x = '2,5';
        var y = '2.5';

        var doubleX = parseFloat(x) * 2;
        var doubleY = parseFloat(y) * 2;

        alert('double x : ' + doubleX + '\n' + 'double y : ' + doubleY);
    }

i see following results in the alert box

double x : 4
double y : 5

Here is the tricky function that i created to handle this problem :

function FixNumberDecimalSeparator(value) {
    return value.replace(',', '.');            
}

When i use this function in the calculate function :

var x = '2,5';
var y = '2.5';

x = FixNumberDecimalSeparator(x);
y = FixNumberDecimalSeparator(y);

var doubleX = parseFloat(x) * 2;
var doubleY = parseFloat(y) * 2;

alert('double x : ' + doubleX + '\n' + 'double y : ' + doubleY);

i see following results in the alert box

double x : 5
double y : 5

I hope this function will be useful for you.