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Javascript Reminder:
The key word 'var' limits a variable to the scope it is being declared in.

Linux Tip:
If you are used to using 'ifconfig', and it is not available, try:
ip addr show

jQuery Tip:
$(this)[0] === this
$(this) returns a jQuery object that allows jQuery functions to work with 'this'.
$('.someclass') would return an array of references, so $(this)[0] returns a reference to 'this'.