Sorry, need to explain it a littlebit more in detail.
Just wrote a plugin and i like to report now some things. To show the report i decide it's best to do it by an iframe, which pops up after clicking on a link, like the about-frame.
Therefore i need the address of a script, that shows the information in this popup frame. This address must be relative, based on the installation.
There's another problem with this, because when i use fixed address in the JS-script and write out only some line's, everything worked well, but when i access for example some function from the API, i got some error message in the script and nothing is shown.