Index: src/wp-admin/js/theme.js
===================================================================
--- src/wp-admin/js/theme.js	(revision 26303)
+++ src/wp-admin/js/theme.js	(working copy)
@@ -661,3 +661,31 @@
 );
 
 })( jQuery );
+
+// Align theme browser thickbox
+var tb_position;
+jQuery(document).ready( function($) {
+	tb_position = function() {
+		var tbWindow = $('#TB_window'),
+			width = $(window).width(),
+			H = $(window).height(),
+			W = ( 1040 < width ) ? 1040 : width,
+			adminbar_height = 0;
+
+		if ( $('body.admin-bar').length ) {
+			adminbar_height = 32;
+		}
+
+		if ( tbWindow.size() ) {
+			tbWindow.width( W - 50 ).height( H - 45 - adminbar_height );
+			$('#TB_iframeContent').width( W - 50 ).height( H - 75 - adminbar_height );
+			tbWindow.css({'margin-left': '-' + parseInt( ( ( W - 50 ) / 2 ), 10 ) + 'px'});
+			if ( typeof document.body.style.maxWidth != 'undefined' )
+				tbWindow.css({'top': 20 + adminbar_height + 'px', 'margin-top': '0'});
+		};
+	};
+
+	$(window).resize( function() {
+		tb_position();
+	});
+});