diff --git a/app/views/attachments/_form.html.erb b/app/views/attachments/_form.html.erb
index 034cbdf1a..8b22ea417 100644
--- a/app/views/attachments/_form.html.erb
+++ b/app/views/attachments/_form.html.erb
@@ -31,7 +31,7 @@
 <span class="add_attachment" style="font-weight:normal;">
     <%#= button_tag "浏览", :type=>"button", :onclick=>"CompatibleSend();" %>
     <!--%= link_to image_tag(),"javascript:void(0)", :onclick => "_file.click()"%-->
-    <%= button_tag "文件浏览", :type=>"button", :onclick=>"_file.click()",:onmouseover => 'this.focus()',:class => 'sb' %>
+    <%= button_tag "文件浏览", :type=>"button", :onclick=>"_file.click()",:onmouseover => 'this.focus()',:class => 'sub_btn' %>
     <%= file_field_tag 'attachments[dummy][file]',
           :id => '_file',
           :class => 'file_selector',
diff --git a/app/views/bids/_new_homework_form.html.erb b/app/views/bids/_new_homework_form.html.erb
index 3150d6b6a..ae091159a 100644
--- a/app/views/bids/_new_homework_form.html.erb
+++ b/app/views/bids/_new_homework_form.html.erb
@@ -6,36 +6,41 @@
 </div>
 <div class="hwork_new">
   <ul>
-      <li  class="ml45">
-        <label><span class="c_red">*</span>&nbsp;<%= l(:field_name)%>&nbsp;&nbsp;：</label>
-        <input  type="text" name="bid[name]" id="bid_name" class="hwork_input" maxlength="<%= Bid::NAME_LENGTH_LIMIT%>" onkeyup="regex_bid_name();" value="<%= @homework.name%>" >
-        <p id="bid_name_span" class="c_red" style="padding-left: 55px;"></p>
-      </li>
-      <li class="ml45">
-        <label class="fl" >&nbsp;&nbsp;<%= l(:field_quote)%>&nbsp;&nbsp;：</label>
-        <textarea  name="bid[description]" placeholder="最多3000个汉字(或6000个英文字符)"  class="hwork_text fl"  ></textarea>
-      </li>
+    <li  class="ml45">
+      <label><span class="c_red">*</span>&nbsp;<%= l(:field_name)%>&nbsp;&nbsp;：</label>
+      <input  type="text" name="bid[name]" id="bid_name" class="hwork_input" maxlength="<%= Bid::NAME_LENGTH_LIMIT%>" onkeyup="regex_bid_name();" value="<%= @homework.name%>" >
+      <p id="bid_name_span" class="c_red" style="padding-left: 55px;"></p>
+    </li>
+    <li class="ml45">
+      <label class="fl" >&nbsp;&nbsp;<%= l(:field_quote)%>&nbsp;&nbsp;：</label>
+      <textarea  name="bid[description]" placeholder="最多3000个汉字(或6000个英文字符)"  class="hwork_text fl"  ></textarea>
+    </li>
+    <div class="cl"></div>
+    <li class="ml21">
+      <label><span class="c_red">*</span>&nbsp;<%= l(:label_limit_time)%>&nbsp;&nbsp;：</label>
+      <input  type="text" name="bid[deadline]" id="bid_deadline" class="hwork_input02" onchange="regexDeadLine();" readonly="readonly" >
+      <%= calendar_for('bid_deadline')%>
+    </li>
+    <li class=" mb5 ml30">
+      <label ><%= l(:label_open_anonymous_evaluation)%>&nbsp;&nbsp;：</label>
+      <input type="checkbox" name="bid[open_anonymous_evaluation]" id="bid_open_anonymous_evaluation" checked="checked"  >
       <div class="cl"></div>
-      <li class="ml21">
-        <label><span class="c_red">*</span>&nbsp;<%= l(:label_limit_time)%>&nbsp;&nbsp;：</label>
-        <input  type="text" name="bid[deadline]" id="bid_deadline" class="hwork_input02" onchange="regexDeadLine();" readonly="readonly" >
-        <%= calendar_for('bid_deadline')%>
-      </li>
-      <li class=" mb5 ml30">
-        <label ><%= l(:label_open_anonymous_evaluation)%>&nbsp;&nbsp;：</label>
-        <input type="checkbox" name="bid[open_anonymous_evaluation]" id="bid_open_anonymous_evaluation" checked="checked"  >
-        <div class="cl"></div>
-      </li>
-      <li class="ml9">
-        <label><span class="c_red">*</span>&nbsp;<%= l(:field_evaluation_num)%>&nbsp;&nbsp;：</label>
-        <input  type="text" name="bid[evaluation_num]" id="bid_evaluation_num" class="hwork_input02" onkeyup="regex_evaluation_num();">
-        <span><%= l(:label_evaluation_description)%></span>
-        <p id="bid_evaluation_num_span" class="c_red" style="padding-left: 90px;"></p>
-      </li>
-      <li class="ml45">
-        <label>&nbsp;&nbsp;<%= l(:label_attachment_plural) %>&nbsp;&nbsp;：</label>
-        <%= render :partial => 'attachments/form', :locals => {:container => @homework} %>
-      </li>
+    </li>
+    <li class="ml9">
+      <label><span class="c_red">*</span>&nbsp;<%= l(:field_evaluation_num)%>&nbsp;&nbsp;：</label>
+      <input  type="text" name="bid[evaluation_num]" id="bid_evaluation_num" class="hwork_input02" onkeyup="regex_evaluation_num();">
+      <span><%= l(:label_evaluation_description)%></span>
+      <p id="bid_evaluation_num_span" class="c_red" style="padding-left: 90px;"></p>
+    </li>
+    <li class="ml45">
+      <label>&nbsp;&nbsp;<%= l(:label_attachment_plural) %>&nbsp;&nbsp;：</label>
+      <%= render :partial => 'attachments/form', :locals => {:container => @homework} %>
+    </li>
+    <li class=" ml90" >
+      <a class="blue_btn fl c_white" onclick="submit_new_bid('<%= bid_id%>');" href="#"><%= l(:button_create)%></a>
+      <%= link_to l(:button_cancel), homework_course_path(@course), :class => "blue_btn grey_btn fl c_white"%>
+      <div class="cl"></div>
+    </li>
   </ul>
 </div>
 <div class="cl"></div>
diff --git a/app/views/courses/new_homework.html.erb b/app/views/courses/new_homework.html.erb
index 04456c4d2..29e09e18d 100644
--- a/app/views/courses/new_homework.html.erb
+++ b/app/views/courses/new_homework.html.erb
@@ -1,8 +1,3 @@
 <%= labelled_form_for @homework, :url => {:controller => 'bids', :action => 'create_homework',:course_id => "#{params[:id] || params[:course_id]}"} do |f| %>
-	<%= render :partial => 'bids/new_homework_form', :locals => { :f => f } %>
-    <li class=" ml90" >
-      <a class="blue_btn fl c_white" onclick="submit_new_bid();" href="#"><%= l(:button_create)%></a>
-      <%= link_to l(:button_cancel), homework_course_path(@course), :class => "blue_btn grey_btn fl c_white"%>
-      <div class="cl"></div>
-    </li>
+	<%= render :partial => 'bids/new_homework_form', :locals => { :bid_id => "new_bid" } %>
 <% end %>
\ No newline at end of file
diff --git a/public/javascripts/course.js b/public/javascripts/course.js
index fdcac6601..f6bc4933c 100644
--- a/public/javascripts/course.js
+++ b/public/javascripts/course.js
@@ -116,10 +116,10 @@ $(function(){
     });
 });
 
-function submit_new_bid()
+function submit_new_bid(id)
 {
     if(regex_bid_name()&&regex_evaluation_num())
     {
-        $("#new_bid").submit();
+        $("#"+id).submit();
     }
 }
\ No newline at end of file
diff --git a/public/stylesheets/public.css b/public/stylesheets/public.css
index d2528510c..7f2641b42 100644
--- a/public/stylesheets/public.css
+++ b/public/stylesheets/public.css
@@ -214,6 +214,53 @@ html>body #ajax-indicator { position: fixed; }
     padding-left: 26px;
     vertical-align: bottom;
 }
+/***** end Ajax indicator ******/
+
+/***** Flash & error messages ****/
+#errorExplanation, div.flash, .nodata, .warning, .conflict {
+    padding: 4px 4px 4px 30px;
+    margin-bottom: 12px;
+    font-size: 1.1em;
+    border: 2px solid;
+}
+
+div.flash {margin-top: 8px;}
+
+div.flash.error, #errorExplanation {
+    background: url(../images/exclamation.png) 8px 50% no-repeat;
+    background-color: #ffe3e3;
+    border-color: #dd0000;
+    color: #880000;
+}
+
+div.flash.notice {
+    background: url(../images/true.png) 8px 5px no-repeat;
+    background-color: #dfffdf;
+    border-color: #9fcf9f;
+    color: #005f00;
+}
+
+div.flash.warning, .conflict {
+    background: url(../images/warning.png) 8px 5px no-repeat;
+    background-color: #FFEBC1;
+    border-color: #FDBF3B;
+    color: #A6750C;
+    text-align: left;
+}
+
+.nodata, .warning {
+    text-align: center;
+    background-color: #FFEBC1;
+    border-color: #FDBF3B;
+    color: #A6750C;
+}
+
+#errorExplanation ul { font-size: 0.9em;}
+#errorExplanation h2, #errorExplanation p { display: none; }
+
+.conflict-details {font-size:80%;}
+/***** end Flash & error messages ****/
+
 /*弹出框*/
 .black_overlay{display:none;position:fixed;top:0px;left:0px;width:100%;height:100%;background-color:black;z-index:1001;-moz-opacity:0.8;opacity:.80;filter:alpha(opacity=80);}
 .white_content{display:none;position:fixed;top:15%;left:30%;width:420px;height: auto; margin-bottom:20px;padding:16px;border:3px solid #15bccf;background-color:white;z-index:1002;overflow:auto;}