how do I make sure a page opens in a framset

I have a site built on frames, and I would like to make sure that if people visit a page after i.e. getting a link to it from a search engine, the page will be opened in the frameset I meant for them to belong to, and not as a "stand-alone" page.
Is there a javascript-way to do this?

Hi BigMac!

You could check the location of the topframe (wich should be your frameset-page). If the url is different you could set it to your frameset-page.
Code could look something like this:
if (top.document.location != whatever_url.htm)
{
top.document.location = whatever_url.htm
}

regards
Bjoern