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The JavaScript FAQ
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RGB-to-Hex Conversion

Question: How do I convert RGB values of a color to a hexadecimal string?

Answer: The algorithm is as follows: make sure that RGB values are in the range 0...255, convert RGB values to hex strings, and then merge the three strings.

Here is a script that does this conversion:

function RGBtoHex(R,G,B) {return 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);
Try it yourself:
R: G: B: Copyright © 1999-2006, Alexei Kourbatov

The JavaScript FAQ
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  Mirrored with kind permission of Alexei Kourbatov Design by Interspire