Center the "all done" dialog. Use Jquery and externalize the CSS (I was being

too conservative before).  Fixes ticket #413.

modules/gallery/css/upgrader.css

@@ -0,0 +1,117 @@
+body {
+    background: #eee;
+    font-family: Trebuchet MS;
+    font-size: 1.1em;
+}
+
+h1 {
+    font-size: 1.4em;
+}
+
+div#outer {
+    width: 650px;
+    background: white;
+    border: 1px solid #999;
+    margin: 0 auto;
+    padding: -10px;
+}
+
+div#inner {
+    padding: 0 1em 0 1em;
+    margin: 0px;
+}
+
+div#footer {
+    border-top: 1px solid #ccc;
+    margin: 1em;
+}
+
+td.name {
+    text-align: left;
+    padding-left: 30px;
+}
+
+td {
+    text-align: center;
+    border-bottom: 1px solid #eee;
+}
+
+tr.current td {
+    color: #999;
+    font-style: italic;
+}
+
+tr.current td.gallery {
+    color: #00d;
+}
+
+tr.upgradeable td {
+    font-weight: bold;
+}
+
+tr.upgradeable td.gallery {
+    color: #00d;
+}
+
+table {
+    width: 600px;
+    margin-bottom: 10px;
+}
+
+p {
+    font-size: .9em;
+}
+
+ul {
+    font-size: .9em;
+    list-style: none;
+}
+
+li {
+    display: inline;
+}
+
+li:before {
+    content: "\00BB \0020";
+}
+
+div.button {
+    margin: 0 auto;
+    width: 120px;
+    text-align: center;
+    border: 1px solid #999;
+    background: #eee;
+}
+
+div.button a {
+    text-decoration: none;
+}
+
+div.button:hover {
+    background: #ccc;
+}
+
+div#confirmation {
+    position: absolute;
+    background: blue;
+    z-index: 1000;
+    margin: 10px;
+    text-align: center;
+}
+
+div#confirmation div {
+    margin: 2px;
+    padding: 20px;
+    border: 2px solid #999;
+    background: #eee;
+}
+
+.gray_on_done {
+    opacity: <?= $done ? "0.5" : "1" ?>;
+}
+
+pre {
+    display: inline;
+    margin: 0px;
+    padding: 0px;
+}