diff --git a/chosen/chosen.jquery.js b/chosen/chosen.jquery.js
index 34b6e12..324c82d 100644
--- a/chosen/chosen.jquery.js
+++ b/chosen/chosen.jquery.js
@@ -43,7 +43,7 @@
     };
     Chosen.prototype.set_up_html = function() {
       var container_div, dd_top, dd_width, sf_width;
-      this.container_id = this.form_field.id.length ? this.form_field.id : this.generate_field_id();
+      this.container_id = this.form_field.id.length ? this.form_field.id.replace('.', '_') : this.generate_field_id();
       this.container_id += "_chzn";
       this.f_width = this.form_field_jq.width();
       this.default_text = this.form_field_jq.attr('title') ? this.form_field_jq.attr('title') : this.default_text_default;
@@ -686,7 +686,7 @@
     };
     Chosen.prototype.generate_random_id = function() {
       var string;
-      string = 'sel' + this.generate_random_char() + this.generate_random_char() + this.generate_random_char();
+      string = "sel" + this.generate_random_char() + this.generate_random_char() + this.generate_random_char();
       while ($("#" + string).length > 0) {
         string += this.generate_random_char();
       }
diff --git a/chosen/chosen.proto.js b/chosen/chosen.proto.js
index aa41d76..8058b98 100644
--- a/chosen/chosen.proto.js
+++ b/chosen/chosen.proto.js
@@ -35,7 +35,7 @@
     };
     Chosen.prototype.set_up_html = function() {
       var base_template, container_props, dd_top, dd_width, sf_width;
-      this.container_id = this.form_field.identify() + "_chzn";
+      this.container_id = this.form_field.identify().replace('.', '_') + "_chzn";
       this.f_width = this.form_field.getStyle("width") ? parseInt(this.form_field.getStyle("width"), 10) : this.form_field.getWidth();
       container_props = {
         'id': this.container_id,
diff --git a/coffee/chosen.jquery.coffee b/coffee/chosen.jquery.coffee
index 6098a38..8a2b250 100644
--- a/coffee/chosen.jquery.coffee
+++ b/coffee/chosen.jquery.coffee
@@ -43,7 +43,7 @@ class Chosen
     @choices = 0
 
   set_up_html: ->
-    @container_id = if @form_field.id.length then @form_field.id else this.generate_field_id()
+    @container_id = if @form_field.id.length then @form_field.id.replace('.', '_') else this.generate_field_id()
     @container_id += "_chzn"
     
     @f_width = @form_field_jq.width()
@@ -585,7 +585,7 @@ class Chosen
     new_id
   
   generate_random_id: ->
-    string = 'sel' + this.generate_random_char() + this.generate_random_char() + this.generate_random_char()
+    string = "sel" + this.generate_random_char() + this.generate_random_char() + this.generate_random_char()
     while $("#" + string).length > 0
       string += this.generate_random_char()
     string
diff --git a/coffee/chosen.proto.coffee b/coffee/chosen.proto.coffee
index b8ad47f..da7b5b8 100644
--- a/coffee/chosen.proto.coffee
+++ b/coffee/chosen.proto.coffee
@@ -41,7 +41,7 @@ class Chosen
 
 
   set_up_html: ->
-    @container_id = @form_field.identify() + "_chzn"
+    @container_id = @form_field.identify().replace('.', '_') + "_chzn"
     
     @f_width = if @form_field.getStyle("width") then parseInt @form_field.getStyle("width"), 10 else @form_field.getWidth()