// covert a color to hex

function toHex(dec) {
        // create list of hex characters
        var hexCharacters = "0123456789ABCDEF"
        // if number is out of range return limit
        if (dec < 0)
                return "00"
        if (dec > 255)
                return "FF"
        // decimal equivalent of first hex character in converted number
        var i = Math.floor(dec / 16)
        // decimal equivalent of second hex character in converted number
        var j = dec % 16
        // return hexadecimal equivalent
        return hexCharacters.charAt(i) + hexCharacters.charAt(j)
}