Hello. Can some tell me how I can add/change the background color with the following script?

<!--
Skype 'My status' button
http://www.skype.com/go/skypebuttons
-->
<script type="text/javascript" src="http://download.skype.com/share/skypebutto...></script>
<a href="skype:xxxxxx?call"><img src="http://mystatus.skype.com/balloon/xxxxxxx" style="border: none;" width="150" height="60" alt="My status"/></a>