From Opera 11, extensions can be used to wrap the scripts up to make them easier to distribute.
You can also manually modify your configuration by visiting opera:config, or by editing your opera6.ini file manually. You need to add or modify these settings:
After downloading it, you should change the
line to list the proper URL template to your OWA installation.
I have only tested it with two server versions, the HTML code can vary a bit between servers. I have provided two versions of the script, tailored for the different variants, you might need to change the id for the textarea or the lookup regular expressions to make it work with yours.
Download standard version.
Download version for OWA 2003.