Paste text with relative link.

A tried to paste same text from diffrent page into editor. All my relative links (to anchor) in text (eg. #top) were changed to absolute links (eg. http://www.mydomain.pl/folder_name/edit ... ar=Default). I also tried to make add button:
<script type="text/javascript">
function insertContent()
{

var myContent = "<a href=#index.php>test</a>";

window.frames[0].FCK.InsertHtml(myContent);
}
</script>
<input type="button" value="Insert" onclick="insertContent()">

This also change relative to absolute. Is there any way to make it work?