Unsure How To Do A _main Target In Php

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I did my whole site in PHP, all but the newsletter section, what I can not figure out is how to get the links for the newsletter to appear, and to get the newsletter (which is in PDF) to appear where the index would be...(ok who did I lose) I want it to act like a frame. you load up the page, click a link and you go to the newsletter page all with links, and as you click a link the page changes in the main area but the links for the newsletter stays till you click home, then the main page comes back.<br /><br />Sorry if this made no sense.<br /><br />But here is the link for the site:<br /><br />www.jaysarahandy.com <img src="http://www.totalchoicehosting.com/forums/style_emoticons/default/tchrocks!.gif" style="vertical-align:middle" emoid=":tchrocks!:" border="0" alt="tchrocks!.gif" /><!--content-->