My initial guess is that you have your picture keyed to one of the "Heading" styles that create the TOC. If that is the case, simply change the style of the picture/text to the same style that you use for the text in the body of your document (i.e., Body Text). Then update the index (picture and unwanted text should be removed).

I thought that was the case as well, but the picture and text is written in the first "heading style", called "normal" (in norwegian at least). So is the main text for the rest of the document. The headings that I have made my self is in a "home made" style.

I tried change some of the text to a "heading style" number two, and that helped. If I try this with the other unwanted text part and the picture however the text and picture jump out of its box. This is a premade front page from school, so I can't really go and change the look of it. Though it is tempting.