Permalinks with images not showing

I got a problem, I am running wordpress on xampp, now when i add a new page and view it with default permalinks the new page shows fine with all images, but when i change permalinks to postname, then i can’t able to see any image that i include in header.php.
this is the format i have added images
<img src=”wp-content/themes/twentyten/images/logo.png”>