Extended Network, Replacing Options

[crlyqbabygrl]

I've attempted to replace the "Extended Network" box with an image, but that didn't turn out too well. I used this code:

<br />
<style type="text/css"><br />
table table table td {vertical-align:top ! important;}<br />
span.blacktext12 {<br />
visibility:visible !important;<br />
background-color:transparent;<br />
background-image:url("IMG URL HERE");<br />
background-repeat:no-repeat;<br />
background-position:center center;<br />
font-size:0px; letter-spacing:-0.5px;<br />
width:435px; height:75px; display:block !important; }<br />
span.blacktext12 img {display:none;}<br />
</style> <br />

but it didn't work.

Is there just a code for just adding a different text than "Username is in your extended network," and if not is there an alternate code for replacing it with an image?

Thanks