Index: wp-admin/js/media-upload.js
===================================================================
--- wp-admin/js/media-upload.js	(revision 8190)
+++ wp-admin/js/media-upload.js	(working copy)
@@ -24,7 +24,7 @@
 			tbWindow.width( W - 50 ).height( H - 45 );
 			$('#TB_iframeContent').width( W - 50 ).height( H - 75 );
 			tbWindow.css({'margin-left': '-' + parseInt((( W - 50 ) / 2),10) + 'px'});
-			if ( ! ( $.browser.msie && $.browser.version.substr(0,1) < 7 ) )
+			if ( typeof document.body.style.maxWidth != 'undefined' )
 				tbWindow.css({'top':'20px','margin-top':'0'});
 			$('#TB_title').css({'background-color':'#222','color':'#cfcfcf'});
 		};
Index: wp-admin/js/theme-preview.js
===================================================================
--- wp-admin/js/theme-preview.js	(revision 8190)
+++ wp-admin/js/theme-preview.js	(working copy)
@@ -12,7 +12,7 @@
 			tbWindow.width( W - 90 ).height( H - 60 );
 			$('#TB_iframeContent').width( W - 90 ).height( H - 90 );
 			tbWindow.css({'margin-left': '-' + parseInt((( W - 90 ) / 2),10) + 'px'});
-			if ( ! ( $.browser.msie && $.browser.version.substr(0,1) < 7 ) )
+			if ( typeof document.body.style.maxWidth != 'undefined' )
 				tbWindow.css({'top':'30px','margin-top':'0'});
 		};
 
Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 8190)
+++ wp-includes/script-loader.php	(working copy)
@@ -159,7 +159,7 @@
 			'edit' => __('Edit'),
 		) );
 		$scripts->add( 'admin-gallery', '/wp-admin/js/gallery.js', array( 'jquery-ui-sortable' ), '20080520' );
-		$scripts->add( 'media-upload', '/wp-admin/js/media-upload.js', array( 'thickbox' ), '20080624' );
+		$scripts->add( 'media-upload', '/wp-admin/js/media-upload.js', array( 'thickbox' ), '20080625' );
 		$scripts->localize( 'upload', 'uploadL10n', array(
 			'browseTitle' => attribute_escape(__('Browse your files')),
 			'back' => __('&laquo; Back'),
@@ -200,7 +200,7 @@
 			'error' => __('Error:')
 		));
 		
-		$scripts->add( 'theme-preview', '/wp-admin/js/theme-preview.js', array( 'thickbox', 'jquery' ), '20080523' );
+		$scripts->add( 'theme-preview', '/wp-admin/js/theme-preview.js', array( 'thickbox', 'jquery' ), '20080625' );
 	}
 }