Формат числа

function number_format( number, decimals, dec_point, thousands_sep )
{
var i, j, kw, kd, km;

if( isNaN(decimals = Math.abs(decimals)) ){
decimals = 2;
}

if( dec_point == undefined ){
dec_point = ",";
}

if( thousands_sep == undefined ){
thousands_sep = ".";
}

i = parseInt(number = (+number || 0).toFixed(decimals)) + "";

if( (j = i.length) > 3 )
{
j = j % 3;
}
else
{
j = 0;
}

km = (j ? i.substr(0, j) + thousands_sep : "");

kw = i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thousands_sep);

kd = (decimals ? dec_point + Math.abs(number - i).toFixed(decimals).replace(/-/, 0).slice(2) : "");

return km + kw + kd;
}