A couple of functions to apply currency format to an amount number in javascript

CurrencyFormatter.js

function applyFormat(value){

	value = typeof value == 'number' ? value.toString() : value;
	value = value.replace(/\$|\,/g, '');

	if( isNaN(value) ){
		return '$X,XXX';
	}

	var integer = value.split('.')[0];
	var decimal = value.split('.')[1] ? '.' + value.split('.')[1] : '' ;

	return '$' + addCommas(integer) + decimal;

}

function addCommas(digits, complete_str){

	complete_str = complete_str || '';
	var length = digits.length;
	
	if( length / 3 > 1 ){
		complete_str = ',' + digits.slice(length - 3, length ) + complete_str;
		return addCommas( digits.slice(0, length - 3), complete_str );
	} else {
		return digits + complete_str;
	}
}