Webex on RHEL or Fedora

For good or bad, the company I work for uses Webex for collaboration.  I've made several attempts to try getting this to run under Firefox or Chrome in RHEL 5 and 6 and Fedora 14.  Has anyone else been successful in getting Webex meetings to work on a Linux platform and care to share what they've done?

2021 Update: To install Webex on Linux, see https://help.webex.com/en-us/9vstcdb/Webex-for-Linux