Ajax drop-down box?

[twizzlers]

Not sure if this is AJAX or java or php...but I want to add a drop down chat box on my site


I have the code for the chatbox

<!-- BEGIN CBOX - www.cbox.ws -->
<div align="center" id="cboxdiv">
<iframe frameborder="0" width="300" height="100" src="http://www4.cbox.ws/box/?boxid=3522815&amp;boxtag=zacwjc&amp;sec=main" marginheight="2" marginwidth="2" scrolling="auto" allowtransparency="yes" name="cboxmain" style="border:#DBE2ED 1px solid;" id="cboxmain"></iframe><br/>
<iframe frameborder="0" width="300" height="75" src="http://www4.cbox.ws/box/?boxid=3522815&amp;boxtag=zacwjc&amp;sec=form" marginheight="2" marginwidth="2" scrolling="no" allowtransparency="yes" name="cboxform" style="border:#DBE2ED 1px solid;border-top:0px" id="cboxform"></iframe>
</div>
<!-- END CBOX -->

and I tried making a chat_box.php file, but it turned out with all these weird symbols...I think I have to make an AJAX?
Can anyone kinda point me in the direction of how I could do that? I have no AJAX knowledge...

Thanks in advance