jQuery form plugin, submit in the wordpress way

If you want to use the WordPress functions in your process.php file then there is a way for you.

simply put these two lines of code at the top of your process.php file

$blogheader = explode("wp-content",$_SERVER["SCRIPT_FILENAME"]);
include $blogheader[0]."wp-blog-header.php";

Now you can use the WordPress functions in your file and do what you want.
Will that work for you?