Роман

var bp = $('elem').css('backgroundPosition').split(' ');
var bpx = bp[0], bpy = bp[1];

$('.close').click(function(){      
        $('iframe').attr('src', $('iframe').attr('src'));
    });

$(".add").on('click', function(){
   $(".backh").addClass("on_backh"); 
   return false;
  });

$(".hide").on('click', function(){
   $(".backh").removeClass("on_backh"); 
   return false;
  });

append('<div class="task"><input type="checkbox" name="post" class="write-post"><span class="vall">' + myTask + "</span></div>");