JavaScript Converting hex to rbg colors

<p><a href="javascript:color(123,321,154)">ffff</a>
<script>
<!--
function Hex(num) {
        var HexChars="0123456789ABCDEF";
        var i=Math.floor(num/16)
        var j=num%16
        return HexChars.charAt(i)+HexChars.charAt(j);
}

function color(r,g,b) {
        document.bgColor="#"+Hex(r)+Hex(g)+Hex(b)
}
-->
</script>