adding parameter to existing url

[Jimmi08]

Question

I am adding URL parameter with javascript. This is an example, it could be something else.

`onChange="document.location = '".e_REQUEST_SELF."?skin=' + this.options[this.selectedIndex].value + '$querystring';">";

The actual page shouldn't change. Because it works almost everywhere, I am curious why it fails sometimes. I thought it was related to SEF-URLs, but it wasn't.

Remove filename from the URL is set ON. Associate Root namespace None.

No issues:

• forum plugin
• news plugin (SEF and legacy URLs, both work)
• gallery (SEF tested, front + pages work)

Problem:
page.php - page.php?skin=xy returns 404, invalid page
all other links (book, chapter, pages, SEF and legacy work)

Frontpage
?skin=xy is changing the layout. not layout for the homepage is detected.
I tried it with index.php?skin=xy too, the same problem, the layout is changed (falls to default)

User profile
it can't be used on user profile at all

Thanks