Hi can some one help me I get this error when I use webmaster tools All the URLs in your Sitemap are marked as having dynamic content. All the URLs in your Sitemap are marked as having dynamic content (the value of is "always"). Because dynamic content is difficult for search engines to crawl and index, this may impact your site's performance in search results. Check your Sitemap to make sure your site information is correct how do I change the value? Thanks
I recommended you read this post http://googlewebmastercentral.blogspot.com/2008/09/dynamic-urls-vs-static-urls.html. Google give very conflicting views about dynamic and static URL but this post should point you in the right direction.