I noticed that WarDB is part of the Curse Network. I've been usingtheir website for quite some time now without problems, so I don't knowif that's an indication of reliability.

They added the following script that you can use on your site:

• Tooltips with Items, Spells, Quests & NPCs
• Guild Roster
• Search Box

I found a way to change the style of the tooltips, just add this CSS to the FOOTER of your site.

<style type="text/css">
.tooltip-container {
 border: #880088 1px solid;
 background: url(http://i201.photobucket.com/albums/aa236/Mottie1/guildsite/styles/lava.jpg); 
}
.tooltip td, .tooltip th { background:transparent; padding-left: 8px;}
.tooltip-icon {float:right; top:5px; right:7px;}
.tooltip-icon div { background:url(); border: #880088 1px solid;}
</style>

Customize it as follows:

• "tooltip-container" adds a new border style (color is in blue) and tooltip background (URL in orange)
• "tooltip td..." removes the existing border around the tooltip
• "tooltip-icon" repositions the icon inside the tooltip and adds some spacing at the top and rigth side (in red)
• "tooltip-icon div" removes the existing icon border and adds a new one (color in blue).

I haven't had a chance to look into re-styling the guild roster.