--- library/Zend/View/Helper/HtmlElement.php	(revision 24165)
+++ library/Zend/View/Helper/HtmlElement.php	(working copy)
@@ -103,13 +103,17 @@
             $key = $this->view->escape($key);
 
             if (('on' == substr($key, 0, 2)) || ('constraints' == $key)) {
-                // Don't escape event attributes; _do_ substitute double quotes with singles
                 if (!is_scalar($val)) {
                     // non-scalar data should be cast to JSON first
                     require_once 'Zend/Json.php';
                     $val = Zend_Json::encode($val);
                 }
-                $val = preg_replace('/"([^"]*)":/', '$1:', $val);
+
+                // Escape single quotes inside event attribute values.
+                // This will create html, where the attribute value has
+                // single quotes around it, and escaped single quotes or
+                // non-escaped double quotes inside of it
+                $val = str_replace('\'', ''', $val);
             } else {
                 if (is_array($val)) {
                     $val = implode(' ', $val);