mouseover link to another frame

I'm in big trouble, hopefully someone can help me out!

I've used a mouseover link in my nav frame:
<a target="_mitte" href="_mitte/_news.htm" onMouseover="top.frames['_mitte'].location=this.href" style="text-decoration: none">news</a>

I've uploaded the entire site and everything works fine. you can see that, if you go to http://members.kabsi.at/messu

but the public access to my page is over http://www.messu.tk .

There the mouseover link occurs an error message!
I think that I know, what the problem is but I have no idea how to solve it:
The mouseover effect links to the frame "top.frames['_mitte'].location but at www.messu.tk there is no framename like this, because it's only a redirection url.

Can someone help me with this?

Try changing top to parent. You could also break the frames created by tk.

I dont really see the point to the mouseover. It's actually quite annoying. I'd suggest just leaving them as links.