score:1

Accepted answer

While I think that @mg1075's solution of using the plot bands is the best way of doing this, if you wanted to get really crazy you can modify the gridlines through the dom. For example, make every other line red:

$.each($('.highcharts-grid path'), 
  function(i, elem) {     
     if (i % 2 != 0)
     {
        $(elem).attr('stroke','red');
     }
   });
});

Fiddle here.


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