diff --git a/js/JavaScriptParseTree.js b/js/JavaScriptParseTree.js
index fc660f9ec..92999fea8 100644
--- a/js/JavaScriptParseTree.js
+++ b/js/JavaScriptParseTree.js
@@ -52,10 +52,10 @@ JavaScriptParseTree.prototype.renderNode = function(output,node) {
 	var p;
 	switch(node.type) {
 		case "StringLiteral":
-			output.push(utils.stringify(node.value));
+			output.push('"' + utils.stringify(node.value) + '"');
 			break;
 		case "StringLiterals":
-			output.push(utils.stringify(node.value.join("")));
+			output.push('"' + utils.stringify(node.value.join("")) + '"');
 			break;
 		case "FunctionCall":
 			output.push("(");
diff --git a/js/Utils.js b/js/Utils.js
index f8adb216c..39871a034 100755
--- a/js/Utils.js
+++ b/js/Utils.js
@@ -227,12 +227,13 @@ utils.stringify = function(s) {
 	*
 	* For portability, we also escape escape all non-ASCII characters.
 	*/
-	return '"' + s
+	return s
 		.replace(/\\/g, '\\\\')            // backslash
-		.replace(/"/g, '\\"')              // closing quote character
+		.replace(/"/g, '\\"')              // double quote character
+		.replace(/'/g, "\\'")              // single quote character
 		.replace(/\r/g, '\\r')             // carriage return
 		.replace(/\n/g, '\\n')             // line feed
-		.replace(/[\x80-\uFFFF]/g, utils.escape) + '"'; // non-ASCII characters
+		.replace(/[\x80-\uFFFF]/g, utils.escape); // non-ASCII characters
 };
 
 // Creates an HTML element string from these arguments: