RGB to hexa javascript convertor code

<script type="text/javascript" language="JavaScript">

        function hexToR(h) { return parseInt((cutHex(h)).substring(0, 2), 16) }

        function hexToG(h) { return parseInt((cutHex(h)).substring(2, 4), 16) }

        function hexToB(h) { return parseInt((cutHex(h)).substring(4, 6), 16) }

        function cutHex(h) { return (h.charAt(0) == "#") ? h.substring(1, 7) : h }

        function setColor (id, sColor) {

            var elem;

            if (document.getElementById) {

                if (elem = document.getElementById(id)) {

                    if (elem.style) { elem.style.backgroundColor = "#" + sColor; }  else {

                    }

                }

            }

        }

    </script>

<span id="colorSample" style="border: 1px solid gray;">                      </span>

<div>

<input type="text" name="hex" size="7" maxlength="7" value="FFFFFF">

<input type="button" name="btn" value="RGB"   onclick="setColor('colorSample',this.form.hex.value);

this.form.r.value=hexToR(this.form.hex.value);

this.form.g.value=hexToG(this.form.hex.value);

this.form.b.value=hexToB(this.form.hex.value);

">

        R:<input type="text" name="r" size="3" style="width: 33px;">

        G:<input type="text" name="g" size="3" style="width: 33px;">

        B:<input type="text" name="b" size="3" style="width: 33px;">

    </div>