Show a Yes/No dialog.
This function shows a Yes/No dialog
with the given message. ask will return 1 if the user
clicked 'yes' or 0 otherwise.
syntax:
ask
examples:
just bring up the dialog but don't do
anything
ask "are you still here?"
returns stuff depending on
which button the user hits:
if [ask "are you still here?"]
{alert "you should go home";return} else {message "yeah,
right";return}
.
