Hey guys,

I am sort of new to the world of both Google Maps and JavaScript, but
nonetheless I've been working on a map for this project. You can view
the map here:

http://pioneercamp.williams.edu/english/explore/map

As you may notice, currently my map has two marker and generates
polylines when each marker is clicked.

What I need to do, however, is this:

1) I need to create a function which allows me to check if a marker
has already been put in a particular location or not

2) If a marker already exists in a location, I need to have a tabbed
info window pop up when a marker is clicked in that particular
location - the number of tabs should depend on how many data entries
have been made at that location

3) Polylines should be generated when tabs are clicked, and not when
the marker is clicked.

I have tried various different approaches, but almost all of them have
failed me. Also, I have not been able to find anything regarding tab
listeners as well.

I hope you guys can help me out.

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