In c#.net with asp.net how to call javascript if condition on datagrid itemtemplate?

In c#.net with asp.net iam using datagrid which contains 1 hyperlink if i click that link button in datagrid it will open 1 popup depends on some condition .(if it satifies 1 condition it will open 1 window otherwise another window)In c#.net with asp.net how to call javascript if condition on datagrid itemtemplate?
you can construct the hyperlink in the itemcreated event