If you are making an extension for Joomla version 2.5 or above, Joomla has a built-in colorpicker field type. You are recommended to use that rather than this tool.
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The color picker modifies a standard Joomla parameter text field to generate a color picker. It returns a six-digit hexadecimal color code. It decays gracefully - if for any reason the script does not function then the user will see a standard text field. However is has been tested in Internet Explorer 7 and 8, plus Firefox, Google Chrome, Opera and Safari, and should work in any standards compliant browser.