Identify What Page Type I am on

I have some javascript tracking code I need to put on all pages.  If the page is a product page, the js will be different, than if it was on the home page or a category page.  The cart is easy, I can do routeData.Values["controller"].ToString().Equals("checkout", StringComparison.InvariantCultureIgnoreCase something like that.  But the product pages and landing pages use friendly urls that are different.  What is the easiest way for me to do this.

Got it
routeData.Values["action"].ToString().Equals("checkout", StringComparison.InvariantCultureIgnoreCase
this let me know what action was firing so I new what page I was on.