Making the links in an iframe change another iframe

[liunx]

In my website (<!-- m --><a class="postlink" href="http://www28.brinkster.com/stinkweb/indexo.html">http://www28.brinkster.com/stinkweb/indexo.html</a><!-- m -->), i am having trouble making the links in the iframe on the left change the large iframe in the middle of the page. Will someone help me?<!--content-->they worked ok for me, add target="iframename" to the links<!--content-->Thanks for your help.<!--content-->