[Rails] alert with 3 button

When you click [x] the close button, will show the alert with 3 button
like below picture:

Show dialog message
=================================================
Do you want to save changes?
All details will be lost if you don't save them.

Dont' save | cancel | save

=================================================

I am using jquery colorbox, the code as below:

<a class='inline' href="#inline_content">[X]</a>
<div style='display:none'>
<div id='inline_content' style='padding:10px; background:#fff;'>

<b>Do you want to save changes?</b>
All details will be lost if you don't save them.
<br/><br/>
<%= link_to "Don't Save", main_screen_main_path %> |
<a href="javascript:parent.$.colorbox.close()">cancel</a> |
<%= submit_tag "save" %>

</div>
</div>

<script>
$(document).ready(function(){
$(".inline").colorbox({inline:true, width:"500"});
});
</script>

Problem:
When I click "Save" button, it does't works...
What code should I write like :onsubmit => ?? ?
(I am weak for javascript)..

Thanks.

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