add image map script to post

when i add this script to my post html editor :

<div style="text-align:center; width:1100px; margin-left:auto; margin-right:auto;">
<img id="wordlmap" src="http://giftsforfriendsabroad.com/wp-content/uploads/2012/05/worldmap-1024x449.png" usemap="#wordlmap" border="0" width="1100" height="489" alt="" />
<map id="wordlmap" name="wordlmap">
<area shape="rect" coords="845,267,929,324" href="http://wordpress.stackexchange.com/australia" alt="australia" title="australia"/>
</map>
</div>

after updating post, i only get:

<div style="text-align:center; width:1100px; margin-left:auto; margin-right:auto;">
<img id="wordlmap" src="http://giftsforfriendsabroad.com/wp-content/uploads/2012/05/worldmap-1024x449.png" usemap="#wordlmap" border="0" width="1100" height="489" alt="" />

</div>  

can someone help me please, thanks in advance

The post content is filtered by kses, but you can extend the list of allowed tags. A search in the plugin directory for kses shows some useful results.

Try Extend KSES, it seems to be exactly what you need (I haven’t tested it):

This plugin extends the HTML functionalify of the WordPress kses.php file, which states the allowable HTML that the post/page content editor will accept.
It allows the site administrator to check pre-defined HTML tags that can also be allowed via the editor. Tags include: object, embed, param, iframe, map and extensions have been added to the div and img tags.