You receive a script error in IE7 on a computer that is running Windows Server 2003 or Windows XP when you include certain characters to specify a window name parameter in the "Window.Open" method
On a Microsoft Windows Server 2003-based computer or a Microsoft Windows XP-based computer that is running Windows Internet Explorer 7, you receive an Internet Explorer script error.
This symptom occurs if the following conditions are true:
- You use the Window.Open method in Internet Explorer 7.
- You specify a window name parameter in the Window.Open method that includes a character such as Katakana-Hiragana Prolonged Sound Mark (Unicode character code U+30FC).
http://support.microsoft.com/default.aspx/kb/935775