Yes it is indeed HTML.
Open
lib/html.phpfind:
<Tr valign="top">
<td height="42" width="195"><img src="./images/chatlogo.gif" width="195" height="42"></td>
<td height="42"> </td>
edit as so (shown in red):
<Tr valign="top">
<td height="42" width="195"><a href="http://your.home.page/address.htm" target="_parent"><img src="./images/chatlogo.gif" width="195" height="42"></a></td>
<td height="42"> </td>
Save & Close the file.
Now open
frames/new.top.phpfind:
<Tr valign="center">
<td height="42" width="195"><img src="./images/chatlogo.gif" width="195" height="42"></td>
<td height="42">
edit as so (shown in red):
<Tr valign="center">
<td height="42" width="195"><a href="http://your.home.page/address.htm" target="_parent"><img src="./images/chatlogo.gif" width="195" height="42"></a></td>
<td height="42">
Save & Close the file.
You should now be set with your chat logo now being linked to whatever you so desire ^.^
Change ' target="_parent" ' to something different like ' target="myhomepage" ' if you want to load it into a new window.