Do My SQL Statements Conform to the SQL Standard?

While researching for a paper I have to write in class about hierarchical data in relational databases, I was reading Joe Celko's book Trees and Hierarchies in SQL for Smarties. In the intro, he mentions a really useful website for validating SQL-92, SQL-99 and SQL-2003. The site is nice enough but could really benefit from a bit of AJAX. If only I had the code behind the scenes, that'd be a perfect project for learning ASP.NET's AJAX add-on.