Chosen IE7 Prototype.js git-diff

chosen-ie7-prototype-js.diff

diff --git a/chosen/chosen.proto.js b/chosen/chosen.proto.js
index e5049b0..0200299 100644
--- a/chosen/chosen.proto.js
+++ b/chosen/chosen.proto.js
@@ -408,14 +408,15 @@ Copyright (c) 2011 by Harvest
     Chosen.prototype.container_mousedown = function(evt) {
       var target_closelink;
       if (!this.is_disabled) {
-        target_closelink = evt != null ? evt.target.hasClassName("search-choice-close") : false;
+        var target = evt != null && evt.target ? $(evt.target) : null
+        target_closelink = target ? target.hasClassName("search-choice-close") : false;
         if (evt && evt.type === "mousedown" && !this.results_showing) evt.stop();
         if (!this.pending_destroy_click && !target_closelink) {
           if (!this.active_field) {
             if (this.is_multiple) this.search_field.clear();
             document.observe("click", this.click_test_action);
             this.results_show();
-          } else if (!this.is_multiple && evt && (evt.target === this.selected_item || evt.target.up("a.chzn-single"))) {
+          } else if (!this.is_multiple && evt && (evt.target === this.selected_item || target.up("a.chzn-single"))) {
             this.results_toggle();
           }
           return this.activate_field();
@@ -462,7 +463,8 @@ Copyright (c) 2011 by Harvest
     };
 
     Chosen.prototype.test_active_click = function(evt) {
-      if (evt.target.up('#' + this.container_id)) {
+      var target = evt.target ? $(evt.target) : null;
+      if (target && target.up('#' + this.container_id)) {
         return this.active_field = true;
       } else {
         return this.close_field();

IE7 doesn't allow prototype.js to modify the built-in types so this breaks in chosen.js.

We should make a pull request in coffeescript for this.