Applescript/Shell Script reference to the app itself

Hi guys,

i have made an applescript with the following source code:

"

set sound_output to button returned of (display dialog "Select Output Source" buttons {"Computer", "TV"} default button "TV")

if sound_output is "Computer" then do shell script ("cd /Applications/SwitchAudioSource-v1; ./SwitchAudioSource -s 'Built-in Output'")

if sound_output is "TV" then do shell script ("cd /Applications/SwitchAudioSource-v1; ./SwitchAudioSource -s 'HDMI'")

"

I am wondering if there is a way to refer to the abovementioned executable ./SwitchAudioSource (currently located in /Applications) in my compiled applescript somewhere? That is:

Show Package Contents > Contents > Resources > and dump the executabe ./SwitchAudioSource here, and then modify my script to somehow refer to within itself so that my applescript will work regardless of where i place it. Desktop, /Users, even pictures,

i hope this makes sense, thankyou for all your help in advance, cheers mate 

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