Is it even possible to use HTML/Javascript to update a Remedy field on a web form?

We want to be able to capture the user's IP Address when they open the web form. There is a field called "IP Address" already on the form. When users open this form in the Remedy User tool the IP is being captured fine. We would like to do this for the web version of the form as well.

If there is a better way to capture the IP address of the web user, and allow workflow to push it to another Remedy form for logging, please let me know.

Thanks.

Have the Ip address remedy field as a hidden field on the form. Use Javascript in an active link to update the contents of the field
the field shouldshould be accessible in javascript as F'FieldID'. The remedy field needs to be prepended with an F