What is this script call?

I am looking to add a button such as "call me" on my website, adding it on the right bottom.

I need this button to always follow visitor when visitor scroll up and down...

Sort like the zopim chat box that integrate in a website, but I just need a simple button

 

I am using this html code. You need to do any changes.

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript" src="http://lajkovi.webuda.com/js/jquery.cycle.all.2.72.js"></script>
<script type="text/javascript" src="http://lajkovi.webuda.com/js/jquery.easing.1.1.1.js"></script>
<script type="text/javascript" src="http://lajkovi.webuda.com/js/fbslidebox.js"></script>

<!-- Start-->
<div style='position:fixed; z-index:10; width:342px; overflow:hidden; bottom:50px; right:10px; display:none; background:url(http://like-pro.com/images/bottom-lead-bg.png) repeat; -moz-border-radius:15px; -webkit-border-radius:15px; border-radius:15px; border:1px solid #000000;' id='fbslidebox'>
  <div style='width:320px; padding:10px; margin:0 auto; overflow:hidden;'>

  <a href='#' style='float:right; color:#999; padding:0 3px; border:1px solid #CCC; text-decoration:none; font-size:9px; font-family:Verdana, Geneva, sans-serif;' id='fbcloseslidebox'>X</a>
  <strong style='color:#ab0203;'>Contact me</strong>
  <br/>


  <iframe ></iframe>
  </div>

     </div>
  
  <!-- START (hidden counter)-->

Code (markup):

 

What is the button supposed to DO, once clicked?
If all you want is a button fixed to the lower right corner, you don't need any javascript or anything like that, you just need a little bit of HTML and CSS:
HTML:

<form id="callmeform" method="post" action="file_to_load_on_click.something">
  <input type="submit" value="Call me">
</form>

Code (markup):

CSS:

#callmeform {
  position: fixed;
  bottom: 0.5em;
  right: 0.5em;
}
#callmeform input {
  background: green;
  border-radius: 1em;
  width: 5em;
  height: 3em;
  color: white;
  border: 2px solid black;
}

Code (markup):

Example jsfiddle: https://jsfiddle.net/3zzLue9a/

This can of course be styled as you want, and it will stay in that position always.