jQuery.fn.extend({

	numberFormat: function(number, params)
	{ 
		var sDefaults = 
		{                       
			numberOfDecimals: 2,
			decimalSeparator: '.',
			thousandSeparator: ',',
			symbol: ''
		}

		//funcao do jquery que substitui os parametros que nao foram informados pelos defaults
		var options = jQuery.extend(sDefaults, params);

		//CORPO DO PLUGIN
		var decimals = options.numberOfDecimals;
		var dec_point = options.decimalSeparator;
		var thousands_sep = options.thousandSeparator;
		var currencySymbol = options.symbol;

		var exponent = '';
		var numberstr = number.toString ();
		var eindex = numberstr.indexOf ('e');
		if (eindex > -1)
		{
			exponent = numberstr.substring (eindex);
			number = parseFloat (numberstr.substring (0, eindex));
		}

		if (decimals != null)
		{
			var temp = Math.pow (10, decimals);
			number = Math.round (number * temp) / temp;
		}
		var sign = number < 0 ? '-' : '';
		var integer = (number > 0 ? 
		Math.floor (number) : Math.abs (Math.ceil (number))).toString ();

		var fractional = number.toString ().substring (integer.length + sign.length);
		dec_point = dec_point != null ? dec_point : '.';
		fractional = decimals != null && decimals > 0 || fractional.length > 1 ? 
		(dec_point + fractional.substring (1)) : '';
		if (decimals != null && decimals > 0)
		{
			for (i = fractional.length - 1, z = decimals; i < z; ++i)
				fractional += '0';
		}

		thousands_sep = (thousands_sep != dec_point || fractional.length == 0) ? 
		thousands_sep : null;
		if (thousands_sep != null && thousands_sep != '')
		{
			for (i = integer.length - 3; i > 0; i -= 3)
				integer = integer.substring (0 , i) + thousands_sep + integer.substring (i);
		}

		if (options.symbol == '') {
			return sign + integer + fractional + exponent;
		}
		else {
			return currencySymbol + ' ' + sign + integer + fractional + exponent;
		}
	}
});