Format currency using javascript

I need to format a number to make sure I always get eg: $1,857.84 using javascript.
in PHP I use money_format('%.2n', $dollars);

Does someone have a solution ?
prowebinteractiveincAsked:
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Big MontySenior Web Developer / CEO of ExchangeTree.org Commented:
here's a script I've used in the past:

function formatCurrency(num) {
num = num.toString().replace(/\$|\,/g,'');
if(isNaN(num))
num = "0";
sign = (num == (num = Math.abs(num)));
num = Math.floor(num*100+0.50000000001);
cents = num%100;
num = Math.floor(num/100).toString();
if(cents<10)
cents = "0" + cents;
for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
num = num.substring(0,num.length-(4*i+3))+','+
num.substring(num.length-(4*i+3));
return (((sign)?'':'-') + '$' + num + '.' + cents);
}

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