$(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(200);
				$(this).toggleClass("msg_head-open");
			});
			
			$("div#selected_doctor").parents(".msg_body").show();
			$("div#selected_doctor").parents(".msg_body").toggleClass("msg_head-open");
		});