Java Script Error: permission denied for URL Iviews

Hi,

We are having a URL iview pointing to http://xxx/xxx/default.htm.This is assined to a role.The home tab of the URL iview is loading fine,But if we go to the next link inside that iview it gives java scipt error at the bottom.

<b>Error:Top.navigation.document is Null or not an object

code:0

URL: http://xxx/xxx/topframe.html</b>After launching the URL independently outside the portal everything looks to be fine.

EP 6.0SP10

Regards

Rani A