[Tickets #10118] ?tagName? is null or is not an object

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Ticket URL: http://bugs.horde.org/ticket/10118
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  Ticket             | 10118
  Created By         | wangshichen17 at gmail.com
  Summary            | ?tagName? is null or is not an object
  Queue              | Horde Base
  Version            | 4.0.3
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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wangshichen17 at gmail.com (2011-05-24 12:52) wrote:

HI, recently I use the new version horde framework. And I found  
somthing wrong about the  configuration of the preference.

Configureing [preference] --> [Global Preference] --> [classification  
and tag], there are two ways about changing the color of the tag. one  
is that type the RGB of the color directly, another is that click the  
image. and it should pump a small window to let user to choose the  
color the user want. and I found that when I click the image, there is  
a javascript error happening like as followed:
   ?tagName? is null or is not an object [in prototype.js]

is there a bug in the javascript code??