To get the Avail Control Panel to work in Internet Explorer, the following needs to be set:
1. Open Internet Explorer
2. Open Tools -> Internet options
3. Click the Security tab, Trusted sites and add the address to the where the emark instance is running (for example http://127.0.0.1) to "Trusted Sites"
4. Still on Trusted sites, click the "Custom level..." button
5. Under Miscellaneous: set "Access data sources across domains" to Enable, set "Display mixed content" to Enabled
6. Click OK
7. Click the Advanced tab
8. Under security, uncheck the "Enable native XMLHTTP support" checkbox
9. Click "Apply" button

To read more about Trusted sites, go to:
http://msdn.microsoft.com/en-us/library/ms537183%28VS.85%29.aspx#trusted
To read more about Access data across domains, go to
http://msdn.microsoft.com/en-us/library/ms762300%28VS.85%29.aspx
To read more about Display mixed content, go to
http://msdn.microsoft.com/en-us/library/ee264315%28VS.85%29.aspx
To read more about Enable native XMLHTTP support, go to
http://msdn.microsoft.com/en-us/library/ms537505%28VS.85%29.aspx