Add style="margin:0" to the body tag of your iframed page... then also remove the div class="pgOuterWrapper" of the outer div from the framed page since that is adding a margin as well.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.