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diff --git a/wp-admin/js/media-upload.js b/wp-admin/js/media-upload.js
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+/**
+ * Contains global functions for the media upload within the post edit screen.
+ *
+ * Updates the ThickBox anchor href and the ThickBox's own properties in order
+ * to set the size and position on every resize event. Also adds a function to
+ * send HTML or text to the currently active editor.
+ *
+ * @file
+ * @since 2.5.0
+ * @output wp-admin/js/media-upload.js
+ *
+ * @requires jQuery
+ */
+
+/* global tinymce, QTags, wpActiveEditor, tb_position */
+
+/**
+ * Sends the HTML passed in the parameters to TinyMCE.
+ *
+ * @since 2.5.0
+ *
+ * @global
+ *
+ * @param {string} html The HTML to be sent to the editor.
+ * @return {void|boolean} Returns false when both TinyMCE and QTags instances
+ *                        are unavailable. This means that the HTML was not
+ *                        sent to the editor.
+ */
+window.send_to_editor = function( html ) {
+	var editor,
+		hasTinymce = typeof tinymce !== 'undefined',
+		hasQuicktags = typeof QTags !== 'undefined';
+
+	// If no active editor is set, try to set it.
+	if ( ! wpActiveEditor ) {
+		if ( hasTinymce && tinymce.activeEditor ) {
+			editor = tinymce.activeEditor;
+			window.wpActiveEditor = editor.id;
+		} else if ( ! hasQuicktags ) {
+			return false;
+		}
+	} else if ( hasTinymce ) {
+		editor = tinymce.get( wpActiveEditor );
+	}
+
+	// If the editor is set and not hidden,
+	// insert the HTML into the content of the editor.
+	if ( editor && ! editor.isHidden() ) {
+		editor.execCommand( 'mceInsertContent', false, html );
+	} else if ( hasQuicktags ) {
+		// If quick tags are available, insert the HTML into its content.
+		QTags.insertContent( html );
+	} else {
+		// If neither the TinyMCE editor and the quick tags are available,
+		// add the HTML to the current active editor.
+		document.getElementById( wpActiveEditor ).value += html;
+	}
+
+	// If the old thickbox remove function exists, call it.
+	if ( window.tb_remove ) {
+		try { window.tb_remove(); } catch( e ) {}
+	}
+};
+
+(function($) {
+	/**
+	 * Recalculates and applies the new ThickBox position based on the current
+	 * window size.
+	 *
+	 * @since 2.6.0
+	 *
+	 * @global
+	 *
+	 * @return {Object[]} Array containing jQuery objects for all the found
+	 *                    ThickBox anchors.
+	 */
+	window.tb_position = function() {
+		var tbWindow = $('#TB_window'),
+			width = $(window).width(),
+			H = $(window).height(),
+			W = ( 833 < width ) ? 833 : width,
+			adminbar_height = 0;
+
+		if ( $('#wpadminbar').length ) {
+			adminbar_height = parseInt( $('#wpadminbar').css('height'), 10 );
+		}
+
+		if ( tbWindow.length ) {
+			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'});
+		}
+
+		/**
+		 * Recalculates the new height and width for all links with a ThickBox class.
+		 *
+		 * @since 2.6.0
+		 */
+		return $('a.thickbox').each( function() {
+			var href = $(this).attr('href');
+			if ( ! href ) return;
+			href = href.replace(/&width=[0-9]+/g, '');
+			href = href.replace(/&height=[0-9]+/g, '');
+			$(this).attr( 'href', href + '&width=' + ( W - 80 ) + '&height=' + ( H - 85 - adminbar_height ) );
+		});
+	};
+
+	// Add handler to recalculates the ThickBox position when the window is resized.
+	$(window).on( 'resize', function(){ tb_position(); });
+
+})(jQuery);