JavaScript number_format function

function number_format (number, decimals, dec_point, thousands_sep) {  // http://kevin.vanzonneveld.net  // +   original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)  // +     bugfix by: Michael White (http://getsprink.com)  // +     bugfix by: Benjamin Lupton  // +     bugfix by: Allan Jensen (http://www.winternet.no)  // +    revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)  // +     bugfix by: Howard Yeend  // +    revised by: Luke Smith (http://lucassmith.name)  // +     bugfix by: Diogo Resende  // +     bugfix by: Rival  // +      input by: Kheang Hok Chin (http://www.distantia.ca/)  // +   improved by: davook  // +   improved by: Brett Zamir (http://brett-zamir.me)  // +      input by: Jay Klehr  // +   improved by: Brett Zamir (http://brett-zamir.me)  // +      input by: Amir Habibi (http://www.residence-mixte.com/)  // +     bugfix by: Brett Zamir (http://brett-zamir.me)  // +   improved by: Theriault  // +      input by: Amirouche  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)  // *     example 1: number_format(1234.56);  // *     returns 1: '1,235'  // *     example 2: number_format(1234.56, 2, ',', ' ');  // *     returns 2: '1 234,56'  // *     example 3: number_format(1234.5678, 2, '.', '');  // *     returns 3: '1234.57'  // *     example 4: number_format(67, 2, ',', '.');  // *     returns 4: '67,00'  // *     example 5: number_format(1000);  // *     returns 5: '1,000'  // *     example 6: number_format(67.311, 2);  // *     returns 6: '67.31'  // *     example 7: number_format(1000.55, 1);  // *     returns 7: '1,000.6'  // *     example 8: number_format(67000, 5, ',', '.');  // *     returns 8: '67.000,00000'  // *     example 9: number_format(0.9, 0);  // *     returns 9: '1'  // *    example 10: number_format('1.20', 2);  // *    returns 10: '1.20'  // *    example 11: number_format('1.20', 4);  // *    returns 11: '1.2000'  // *    example 12: number_format('1.2000', 3);  // *    returns 12: '1.200'  // *    example 13: number_format('1 000,50', 2, '.', ' ');  // *    returns 13: '100 050.00'  // Strip all characters but numerical ones.  number = (number + '').replace(/[^0-9+\-Ee.]/g, '');  var n = !isFinite(+number) ? 0 : +number,    prec = !isFinite(+decimals) ? 0 : Math.abs(decimals),    sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep,    dec = (typeof dec_point === 'undefined') ? '.' : dec_point,    s = '',    toFixedFix = function (n, prec) {      var k = Math.pow(10, prec);      return '' + Math.round(n * k) / k;    };  // Fix for IE parseFloat(0.55).toFixed(0) = 0;  s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.');  if (s[0].length > 3) {    s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep);  }  if ((s[1] || '').length < prec) {    s[1] = s[1] || '';    s[1] += new Array(prec - s[1].length + 1).join('0');  }  return s.join(dec);}