the problem is right here (said on error msg):
u should use session_register("myusername") after declare the name.
i taken from my php chm
It is currently impossible to register resource variables in a session. For
example, you cannot create a connection to a database and store the connection
id as a session variable and expect the connection to still be valid the next
time the session is restored. PHP functions that return a resource are
identified by having a return type of resource in their function definition. A
list of functions that return resources are available in the resource types
if you understand what statement above.. conguration, if not.. don't shock.. me
for phpWin.. this topic perhaps easy for you to answer.