diff --git a/wp-admin/js/media-upload.js b/wp-admin/js/media-upload.js
index d19e0be27d..99acd263f5 100644
--- a/wp-admin/js/media-upload.js
+++ b/wp-admin/js/media-upload.js
@@ -24,7 +24,7 @@ jQuery(function($) {
 			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'});
 			$('#TB_title').css({'background-color':'#222','color':'#cfcfcf'});
 		};
diff --git a/wp-admin/js/theme-preview.js b/wp-admin/js/theme-preview.js
index 43b01cd844..f4f85e8bf8 100644
--- a/wp-admin/js/theme-preview.js
+++ b/wp-admin/js/theme-preview.js
@@ -12,7 +12,7 @@ jQuery(function($) {
 			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'});
 		};
 
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 76cb7e460a..76c88092e0 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -159,7 +159,7 @@ function wp_default_scripts( &$scripts ) {
 			'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' );
 		$scripts->localize( 'upload', 'uploadL10n', array(
 			'browseTitle' => attribute_escape(__('Browse your files')),
 			'back' => __('&laquo; Back'),
@@ -200,7 +200,7 @@ function wp_default_scripts( &$scripts ) {
 			'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' );
 	}
 }