Em Dash character causes an exception in base64.js

[GoogleCodeExporter]

What steps will reproduce the problem?
1. var Value = base64.encode('Budget – 5 simple steps');
2. the - is actually the EM Dash character
3.

What is the expected output? What do you see instead?
Expected to see: 'QnVkZ2V0IOKAkyA1IHNpbXBsZSBzdGVwcw==' (according to 
http://www.base64encode.org/)
Instead received an exception and the script stopped running

What version of the product are you using? On what operating system?
base64.js, r230, Mar 29, 2010, nickgsuperstar

Please provide any additional information below.

Original issue reported on code.google.com by stuartto...@gmail.com on 27 Feb 2014 at 4:19