bgcolor RGB 和16进制之间的转换，16进制转RGB，源码

<p>bgcolor RGB 和16进制之间的转换，16进制转RGB，源码例如：<br />
输入 201,255,201 转换成 #C9FFC9</p>
<p>
    输入 #C9FFC9 转换成 201,255,201
</p>
<script type="text/javascript">// <![CDATA[
function RGBtoHex() {
        R=document.form.R.value;
        G=document.form.G.value;
        B=document.form.B.value;
        return document.form.res.value='#'+(toHex(R)+toHex(G)+toHex(B));
    }  
    function toHex(N) 
    {  
        if (N==null) return "00";  
        N=parseInt(N); 
        if (N==0 || isNaN(N)) return "00";  
        N=Math.max(0,N); N=Math.min(N,255); N=Math.round(N);  
        return "0123456789ABCDEF".charAt((N-N%16)/16)+ "0123456789ABCDEF".charAt(N%16); 
     }
// ]]></script>
<p>&nbsp;</p>
<form action="" name="form"> <strong>R<input type="text" name="R" size="3" maxlength="3" /> G<input type="text" name="G" size="3" maxlength="3" /> B<input type="text" name="B" size="3" maxlength="3" /> <input onclick="RGBtoHex();" type="button" value="转换" /> <input type="text" name="res" size="25" /><br />
</strong>
</form>
<p>&nbsp;</p>
<p>
<strong><br />
</strong></p>
<p>
    <br />
</p>
<p>
    <br />
</p>
<script type="text/javascript">// <![CDATA[
function HextoRGB() {
        var v = document.form1.res.value;
        if(v[0] != '#') v='#'+v; 
        document.form1.R.value = toTen(v[1])*16+parseInt(toTen(v[2]));
        document.form1.G.value = toTen(v[3])*16+parseInt(toTen(v[4]));
        document.form1.B.value = toTen(v[5])*16+parseInt(toTen(v[6]));
    }  
    function toTen(num) 
    {  
        var result=0;
        switch (num){
            case "1":case "2":case "3":case "4":case "5":case "6":case "7":case "8":case "9":
                result =num;
                break;
            case "A":case "a":
                result = 10;
                break;
            case "B":case "b":
                result = 11;
                break;
            case "C":case "c":
                result = 12;
                break;
            case "D":case "d":
                result = 13;
                break;
            case "E":case "e":
                result = 14;
                break;
            case "F":case "f":
                result = 15;
                break;
            default:
                break;
                }
        return result;
    }
// ]]></script>
<form action="" name="form1"><input type="text" name="res" size="25" maxlength="7" /> <input onclick="HextoRGB();" type="button" value="转换" /> R<input type="text" name="R" size="3" maxlength="3" /> G<input type="text" name="G" size="3" maxlength="3" /> B<input type="text" name="B" size="3" maxlength="3" /></form>