How can I check for 'undefined'?

Hi,
I am creating a custom MP3 player where audio playback is
started by clicking on the title of the audio, but I also want to
be able to start play abck from the Play/Pause button. In order to
implement this dual approach, I am thinking of checking if a sound
has been loaded (with 'mySound.loadSound("path to sound") already
by the my titleButton.
I am thinking of doing this by checking the
'mySound.position' as that would be 'undefined' if there was no
sound loaded.
But how can I check it for being 'undefined', what woud be
the syntax? Itexpects a number so I tried -1, but that didn't work.
Or is there a better way?
Thx,
Nik
have a Play/Pause button and for it in order to

Found the answer.
The code is of course:
etc. //
if (mySound.position == undefined) {
// etc.
I had a erroe else where.
NIk

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