title: HTML 5 Canvas - Grid Block Fill-In
body: <p>I've created a Canvas and have written out a grid(resembles graph paper) with the X &amp; Y coordinates successfully.  What I'm looking to do now is the following:</p>
  
  <p>-When someone clicks with a mouse a square in the grid will change to a different color<br>
  -Once a block is selected that data will not change</p>