[l2h] something wrong in converting equation

[Xia Bin]

Hi all
  I am a newer in l2h. When I try to use l2h to convert a tex file to html,
two lines are added in the picture of equation. How can I eliminate these
lines? Thanks for you help.
 The sample can be found in http://bcmi.sjtu.edu.cn/~xiabin/isnn06/
  bin
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