function calendarPrevMonth() {
  //$("#calendar_block_wrapper").css("opacity", "0.6");
  var postArray = $("#calendar_block_form").serializeArray();
  postArray.push({name:"calAction",value:"prev"});
  $.ajax({
    type: "POST",
    cache: false,
    data: postArray,
    success: function(output){
      $("#calendar_block_wrapper").html(output);
      //$("#calendar_block_wrapper").css("opacity", "1.0");
    }
  });
}

function calendarNextMonth() {
  //$("#calendar_block_wrapper").css("opacity", "0.6");
  var postArray = $("#calendar_block_form").serializeArray();
  postArray.push({name:"calAction",value:"next"});
  $.ajax({
    type: "POST",
    cache: false,
    data: postArray,
    success: function(output){
      $("#calendar_block_wrapper").html(output);
      //$("#calendar_block_wrapper").css("opacity", "1.0");
    }
  });
}