diff --git a/www/code/main.js b/www/code/main.js
index ea9a66001..d8b9903f4 100644
--- a/www/code/main.js
+++ b/www/code/main.js
@@ -278,37 +278,9 @@ define([
                 UserList.getLastName(toolbar.$userNameButton, isNew);
             };
 
-            var cursorToPos = function(cursor, oldText) {
-                var cLine = cursor.line;
-                var cCh = cursor.ch;
-                var pos = 0;
-                var textLines = oldText.split("\n");
-                for (var line = 0; line <= cLine; line++) {
-                    if(line < cLine) {
-                        pos += textLines[line].length+1;
-                    }
-                    else if(line === cLine) {
-                        pos += cCh;
-                    }
-                }
-                return pos;
-            };
-
-            var posToCursor = function(position, newText) {
-                var cursor = {
-                    line: 0,
-                    ch: 0
-                };
-                var textLines = newText.substr(0, position).split("\n");
-                cursor.line = textLines.length - 1;
-                cursor.ch = textLines[cursor.line].length;
-                return cursor;
-            };
-
             config.onRemote = function () {
                 if (initializing) { return; }
                 if (isHistoryMode) { return; }
-                var scroll = editor.getScrollInfo();
 
                 var oldDoc = canonicalize(CodeMirror.$textarea.val());
                 var shjson = module.realtime.getUserDoc();
@@ -324,27 +296,7 @@ define([
                     CodeMirror.setMode(highlightMode);
                 }
 
-                //get old cursor here
-                var oldCursor = {};
-                oldCursor.selectionStart = cursorToPos(editor.getCursor('from'), oldDoc);
-                oldCursor.selectionEnd = cursorToPos(editor.getCursor('to'), oldDoc);
-
-                editor.setValue(remoteDoc);
-                editor.save();
-
-                var op = TextPatcher.diff(oldDoc, remoteDoc);
-                var selects = ['selectionStart', 'selectionEnd'].map(function (attr) {
-                    return TextPatcher.transformCursor(oldCursor[attr], op);
-                });
-
-                if(selects[0] === selects[1]) {
-                    editor.setCursor(posToCursor(selects[0], remoteDoc));
-                }
-                else {
-                    editor.setSelection(posToCursor(selects[0], remoteDoc), posToCursor(selects[1], remoteDoc));
-                }
-
-                editor.scrollTo(scroll.left, scroll.top);
+                CodeMirror.setValueAndCursor(oldDoc, remoteDoc, TextPatcher);
 
                 if (!readOnly) {
                     var textValue = canonicalize(CodeMirror.$textarea.val());
diff --git a/www/common/common-codemirror.js b/www/common/common-codemirror.js
index bbaad49df..51e916ddf 100644
--- a/www/common/common-codemirror.js
+++ b/www/common/common-codemirror.js
@@ -239,6 +239,58 @@ define([
             onLocal();
         };
 
+        var cursorToPos = function(cursor, oldText) {
+            var cLine = cursor.line;
+            var cCh = cursor.ch;
+            var pos = 0;
+            var textLines = oldText.split("\n");
+            for (var line = 0; line <= cLine; line++) {
+                if(line < cLine) {
+                    pos += textLines[line].length+1;
+                }
+                else if(line === cLine) {
+                    pos += cCh;
+                }
+            }
+            return pos;
+        };
+
+        var posToCursor = function(position, newText) {
+            var cursor = {
+                line: 0,
+                ch: 0
+            };
+            var textLines = newText.substr(0, position).split("\n");
+            cursor.line = textLines.length - 1;
+            cursor.ch = textLines[cursor.line].length;
+            return cursor;
+        };
+
+        exp.setValueAndCursor = function (oldDoc, remoteDoc, TextPatcher) {
+            var scroll = editor.getScrollInfo();
+            //get old cursor here
+            var oldCursor = {};
+            oldCursor.selectionStart = cursorToPos(editor.getCursor('from'), oldDoc);
+            oldCursor.selectionEnd = cursorToPos(editor.getCursor('to'), oldDoc);
+
+            editor.setValue(remoteDoc);
+            editor.save();
+
+            var op = TextPatcher.diff(oldDoc, remoteDoc);
+            var selects = ['selectionStart', 'selectionEnd'].map(function (attr) {
+                return TextPatcher.transformCursor(oldCursor[attr], op);
+            });
+
+            if(selects[0] === selects[1]) {
+                editor.setCursor(posToCursor(selects[0], remoteDoc));
+            }
+            else {
+                editor.setSelection(posToCursor(selects[0], remoteDoc), posToCursor(selects[1], remoteDoc));
+            }
+
+            editor.scrollTo(scroll.left, scroll.top);
+        };
+
         return exp;
     };
 
diff --git a/www/slide/main.js b/www/slide/main.js
index 0d7de7758..a7583f104 100644
--- a/www/slide/main.js
+++ b/www/slide/main.js
@@ -518,37 +518,9 @@ define([
                 UserList.getLastName(toolbar.$userNameButton, isNew);
             };
 
-            var cursorToPos = function(cursor, oldText) {
-                var cLine = cursor.line;
-                var cCh = cursor.ch;
-                var pos = 0;
-                var textLines = oldText.split("\n");
-                for (var line = 0; line <= cLine; line++) {
-                    if(line < cLine) {
-                        pos += textLines[line].length+1;
-                    }
-                    else if(line === cLine) {
-                        pos += cCh;
-                    }
-                }
-                return pos;
-            };
-
-            var posToCursor = function(position, newText) {
-                var cursor = {
-                    line: 0,
-                    ch: 0
-                };
-                var textLines = newText.substr(0, position).split("\n");
-                cursor.line = textLines.length - 1;
-                cursor.ch = textLines[cursor.line].length;
-                return cursor;
-            };
-
             config.onRemote = function () {
                 if (initializing) { return; }
                 if (isHistoryMode) { return; }
-                var scroll = editor.getScrollInfo();
 
                 var oldDoc = canonicalize(CodeMirror.$textarea.val());
                 var shjson = module.realtime.getUserDoc();
@@ -564,27 +536,7 @@ define([
                     CodeMirror.setMode(highlightMode);
                 }
 
-                //get old cursor here
-                var oldCursor = {};
-                oldCursor.selectionStart = cursorToPos(editor.getCursor('from'), oldDoc);
-                oldCursor.selectionEnd = cursorToPos(editor.getCursor('to'), oldDoc);
-
-                editor.setValue(remoteDoc);
-                editor.save();
-
-                var op = TextPatcher.diff(oldDoc, remoteDoc);
-                var selects = ['selectionStart', 'selectionEnd'].map(function (attr) {
-                    return TextPatcher.transformCursor(oldCursor[attr], op);
-                });
-
-                if(selects[0] === selects[1]) {
-                    editor.setCursor(posToCursor(selects[0], remoteDoc));
-                }
-                else {
-                    editor.setSelection(posToCursor(selects[0], remoteDoc), posToCursor(selects[1], remoteDoc));
-                }
-
-                editor.scrollTo(scroll.left, scroll.top);
+                CodeMirror.setValueAndCursor(oldDoc, remoteDoc, TextPatcher);
 
                 if (!readOnly) {
                     var textValue = canonicalize(CodeMirror.$textarea.val());