changing headers to serif, etc 16/26

I keep getting the error msg that I didnt change the h1 to serif. Someone else had this problem. Mine does look correct i will paste the code here. Thanks. link text Add your CSS below!/

h1 {font-family: serif;} h2 {font-family: sans-serif;} h3 {font-family: cursive;}

I will try to post my html in a different window. Im having difficulty moving between windows while keeping this text box open.