To check if javascript is enabled or available in your Web Browser perform the following:
Microsoft Internet Explorer (Windows):
1. Open Internet Explorer,
2. Choose "Tools Internet Options" from the top menu,
3. Click in the "Advanced" tab and scroll down the list until you see "JavaVM", or Java (Sun).
4. If it says JavaVM, select the second option: "Java JIT Compiler Enabled". IF this is already checked then close the window and leave everything as it is.
You can also download Java from
http://java.com/en/download/download_the_latest.jsp
If you are still getting Javascript errors then you are probably affected by a glitch in the browser software. Microsoft has released a MSHTML Security patch that addresses these problems. This can be found on Microsoft's Web site:
http://www.microsoft.com/windows/ie/security/mshtml.asp