Strange permalinks error

[jscustoms]

Hi, Im hoping someone here can help me with my problem.

My website is made in wordpress, and is running a template with some ajax functions. These ajax functions aren't working properly. I found out its in the permalinks. Did some research, and found out my hosting is iss based, so i had to change my web.config to get the permalinks working.
But that didn't do the trick. I have 2 issues:

- Going to http://joeysmit.nl gives an error (Found out its placing the url with www. behind the normal url..)
-Going to http://www.joeysmit.nl gives no error, but the read more (lees meer) function does not work. It starts loading, and returns to the homepage instead of the post.

Can someone help me fix this?

<?xml version="1.0"?> 

<configuration> 
<system.webServer>
<rewrite >
<rules >
<rule name="Main Rule" stopProcessing="true" >
<match url=".*" />
<conditions logicalGrouping="MatchAll" >
<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" / >
<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" / >< /conditions>

</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>