add alternative preloader for spotty connections

copyparty/web/browser.css

@@ -870,11 +870,13 @@ html.light #tree.nowrap .ntree a+a:hover {
 	border-bottom: 1px solid #555;
 }
 #thumbs,
+#au_fullpre,
 #au_osd_cv,
 #u2tdate {
 	opacity: .3;
 }
 #griden.on+#thumbs,
+#au_preload.on+#au_fullpre,
 #au_os_ctl.on+#au_osd_cv,
 #u2turbo.on+#u2tdate {
 	opacity: 1;