Harald:
We ran into a similar situation recently, and here is something that worked for us. The folks at Tegrita Consulting showed us how to do this.
- Go to Setup > Redirect Links
- Click New URL at lower right
- Enter the base URL, up to but not including the "?", i.e. "http://surveywebsite.com"
- Click Save Redirect Link
- A new URL will appear below the URL you entered, labeled "Link Format". It will look something like this: http://secure.p03.eloqua.com/e/er?s=9999999999&lid=99
- Select and copy this URL.
- Paste this URL into your link in the HTML editor, adding an ampersand, and then the static text and field merges you want to appear after the "?", e.g.
<a href="http://secure.p03.eloqua.com/e/er?s=9999999999&lid=99&cs=2431&ident=<span class='eloquaemail'>survey_code</span>">
When save the HTML, Eloqua will change the URL and add some additional parameters. Don't worry about this -- it somehow all resolves.
This technique ensures that the link will be tracked, in addition to adding query parameters where you need them and inserting the field merge content. You can track clickthroughs to this link using a Website report in Insight.
Good luck!
Andy