possible javascript issue

I've been unable to open certain webpages that I used to be able to
open. The error codes that I'm getting have to do with javascript. I've
tried four browsers on my W7 computer, and I get the same error messages
with each. I'm able to open the pages on my iPad, however.

1. My phone company/ISP allows me to click on Chat, for example, but
when I try to do so, nothing happens and I get this error message:
javascript:launchChat()

2. I should be able to read my messages to and from Amazon in its
Message Center, but when I try, nothing happens and I get this error
message: javascript:void(0)

I'd be very grateful for help.

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Thank you,
Jo-Anne