Weekday date object function in datalist

[Chumley the Walrus]

I have a datalist, and I need to display the appropriate weekday
contigent upon the date that exists in my 'showdate' record (which is
a datetime datatype):

<%
if weekday(Container.dataItem("showdate")) = 2 then
response.write "monday"
end if %>

....gives me a "Container is not declared" error

?????
chum