document.addEventListener('keydown', function(e) {
   var key = e.keyCod || e.which;
   switch (key) {
       case 1:
               player.mouseZoom = player.mouseZoom - 0.02;
   }});
document.addEventListener('keydown', function(e) {
   var key = e.keyCod || e.which;
   switch (key) {
       case 2:
               player.mouseZoom = player.mouseZoom - -0.02;
   }});