If a string contains the "Non-breaking space" character (char code 160), Internet Explorer and Safari won't see that as a white-space character and the trim() method won't strip the character from the string.

Here's a small write-up about it: http://www.adamkoch.com/2009/07/25/white-space-and-character-160/

Here's a test page: http://www.adamkoch.com/char160test.html

Both trim methods should return an empty string.

A fix could be to add the character to the trim method's regular expression:

/^(\\s|\\u00A0)+|(\\s|\\u00A0)+$/g