/*
* 
* How to use it:
* var formated_value = $().number_format(final_value);
* 
* Advanced:
* var formated_value = $().number_format(final_value, 
*    {                         
*    numberOfDecimals:3,       
*    decimalSeparator: '.',    
*    thousandSeparator: ',',   
*    symbol: 'R$'              
* 	});                       		
*/
(function($) {

	$.number_format = function(numero, params)
	{
		var sDefaults = 
		{			
			numberOfDecimals: 2,
			decimalSeparator: ',',
			thousandSeparator: '.',
			symbol: ''
		}
 
		var options = jQuery.extend(sDefaults, params);

		var number = numero; 
		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;
		}
	}
})(jQuery);