Problem with Paths since server move

My host changed to a new server and the paths changed, now when I try and upload a file through worpress “Add Media Files to your Library” I get the following error.

Unable to create directory /var/www/html/psp/wp-content/uploads/2011/03. Is its parent directory writable by the server?

The bit I have bolded is the old path, the new path should be

/home/site-name/public_html/

I can’t see where to change the path in the WP Install.

Any help?