Can Google Analytics handle a custom visitor ID?

solution for multiple domains

[snag]

I've got several clients who use GA and a hosted ERP/ASP platform. When a user starts the checkout process, they get redirected to checkout.otherdomain.com. I'm not able to follow the GA help directions about adding JS code to track clicks/forms from one domain to another, due to template restrictions.

It seems like an easy solution (one that has worked with an expensive analytics package) would be to override the default visitor ID with one from the ASP, which tracks the visitor properly between domains. Is there any way in GA to do this?

[tonynoriega]

Do you just want to track outbound clicks to another domain?

if you do, GA provides this:

<a href="http://www.example.com" onClick="javascript: pageTracker._trackPageview('/outgoing/example.com');">

[snag]

No, I'm not interested in outbound clicks. I thought I made it pretty clear that I want to override the client ID that GA uses so I can track sessions across domains.

[tonynoriega]

without the js implementation, you wont be able to do this.

you need to get access to the templates...or pass on that js snippet to whoever does.

[snag]

Doesn't everyone have to do a javascript implementation? I just assumed I could override some utm_ variable with my own user ID and everything would be great. I've done that for other analytics packages before, but can't find any info on it for GA.