Rounding a Number variable in javascript

I have this
code:

function sellByte()
            {
if (player.bytes >= 1) {

 player.bytes =
            player.bytes - 1;
 player.money = player.money + 0.10;

            document.getElementById("bytes").innerHTML = "Bytes: " + player.bytes;

            document.getElementById("money").innerHTML = "$" + player.money;

            }
}

And
whenever I sell a Byte my money value ends up looking like $10.00000003 or something
along those lines, how would I go about rounding the money value UP every time this
function is run?