Adding a Preview to Blog Module

My members are coming from sites where they could preview how their blog post will appear on the site before submitting the post.  They are asking how they can preview their blog posts and the answer I have for them is, "sorry, that is not an option".  I have actually set up the blog post editor so that it is the same width as the blog post view page but members want the preview button.  Has anyone implemented a blog post preview feature?

My guess is that we would follow the procedure for posting a blog post but not send it to the database routines; it would need to open a new window/tab for the preview.  I am not sure of the current procedure that occurs when a blog post is submitted.  A blog post preview would be a nice feature for those that want to make sure how their blog post will be displayed before submitting and then having to go back and edit.  It is also a good way to check for errors, such as a video that was embedded not playing properly.

You can add a preview button to TinyMce,
the preview button will then be in the full editor all places where it's used.
(width 650px / height320px)

You can edit this file: templates/base/scripts/BxBaseEditorTinyMCE.php

code to add is bold

/**
     * Full view initialization params
     */
    protected static $WIDTH_FULL = '650px';
    protected static $CONF_FULL = "
                        plugins: 'autolink,autosave,lists,table,inlinepopups,media,searchreplace,print,paste,fullscreen,preview',
                        width: '100%',
                        height: '320',
                        theme: 'advanced',
                        theme_advanced_buttons1: 'bold,italic,underline,removeformat,|,sub,sup,|,bullist,numlist,|,justifyleft,justifycenter,justifyright,justifyfull,|,undo,redo,|,outdent,indent,blockquote,formatselect,|,hr,link,unlink,image,media',
                        theme_advanced_buttons2: 'anchor,|,tablecontrols,|,visualaid,|,search,replace,|,print,|,fullscreen,cleanup,pastetext,code,preview',

Thanks for the answer but that is not what I meant by a preview of the blog post.  What I want is to open the blog post view page and insert the preview into that page just as it would appear if you published the blog post and then viewed it.