Office web apps Server for Sharepoint 2013

Hello,

I used the following article to install office web apps server and hook it up to a test sharepoint server:http://technet.microsoft.com/en-us/library/jj219455(v=office.15).aspx. The OWAS service was verified as working by loading:https://owas.companyname.com/hosting/discovery

For the sharepoint configuration phase, the following commands were run on the sharepoint machine:

1) New-SPWOPIBinding -ServerName "owas.companyname.com"   -- (owas.companyname.com) is the host name of the owas server)

2) Get-SPWOPIZone
3) Set-SPWOPIZone -zone "external-https"

However, office documents are still launching in the desktop office applications, not in the browser. Any ideas of what else I may need to do?

thanks,

Sherazad