Using Iframes

iframes are small windows, or frames, which allow you to open a website within your website. here's an example:

here's the code for the iframe - you can name it, change the overflow settings, the height, the width, the border and most importantly the target url.
<iframe name="iframename" src="URL GOES HERE" style="width:150px; height:200px; border:0; background-color:#ffffff; overflow:auto;"></iframe>

you can make links open into your iframe like this.
<a href="URL" target="iframename">LINK NAME OR IMAGE CODE</a>

iframes come in really handy, especially if you want to use the same layout/theme on all of your pages, but don't want to go through every page to change it - external css comes in handy at this point, too.