This problem was reported by Tadayuki Baba <###@###.###> via Yokogawa Electric's escalation issue.
When IE window open and close repeatedly , IE becomes freezes for 20 minute or so.

CONFIGURATION :
 OS : WinXP(SP2, Japanese)
 JRE : jre5.0u7
      java version "1.5.0_07"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-b02)
      Java HotSpot(TM) Client VM (build 1.5.0_07-b02, mixed mode, sharing)
 CPU : PentiumIII 700[MHz]
 Mem: 256 MB

REPRODUCE:
 1) Unfold the attached zip file.
 2) Modify ArcTest\testcase\top.html for your directory structure.
 3) Double click the Top.html
  IE windows appears
 4) Select "1.5.0_xx ArcTest" in pull down menu
 5) Set "5000" in t"Interval" textbox
 6) Click "Launch" button
  "ArcTest" is opened and closed automatically

After 20-30 minutes, IE will freeze.