title: Google Maps Javascript v3: checkboc for markers won t work
body: <p>Hi there and greetings to all,</p>
  
  <p>I am trying to have a checkbox for my markers categories on my map (google maps api v3)
  I want to make something similar like this example
  <a href="http://www.geocodezip.com/v3_MW_example_categories.html" rel="nofollow">http://www.geocodezip.com/v3_MW_example_categories.html</a></p>
  
  <p>I copied the source of this example and pasted it in my texteditor so that i could change it and it won' t work. I thought that this was due to the external file</p>
  
  
  
  <p>so i copied this and saved it in a folder named script. It won t work again!</p>
  
  <p>Has anyone else went through this before? My javascript and programming skills are very bad. Thank you</p>