Fun stuff.

  function action(){
    var opacity1 = $('#color-1')[0].getContext('2d').getImageData(0,0,1,1).data[3];
    var opacity2 = $('#color-2')[0].getContext('2d').getImageData(0,0,1,1).data[3];
    if(opacity1 > opacity2){
      $('#color-1').trigger('click');
    }else{
      $('#color-2').trigger('click');
    } 
  };

  setInterval('action()', 100);