$(document).ready(function(){
	//hide the all of the element with class msg_body
	$(".msg_body").hide();
	//toggle the componenet with class msg_body
	$(".msg_head").click(function(){
		$(this).next(".msg_body").slideToggle();
		$(this).toggleClass('close');
		 if ($(this).is('.open')) {
 
	      $(this).removeClass('open');
		  $(this).addClass('close');
 
	  }
	  else{
 
	     $(this).removeClass('close');
		 $(this).addClass('open');
 
	  }
	});
});