function sendJoinGroupMessage(groupId,groupName,msgType,isOpen){
   if($.cookie("usr_id") == null){
   	  alert("请您登录后再加入该群！");
   	  return;
   }
   
   if($.cookie("usr_type") == 30){
   	  alert("对不起，教育装备用户不能加入任何群组！");
   	  return;
   }
	
	var _context = "";
    if (window.APPLICATION_CONTEXT) {
      _context = APPLICATION_CONTEXT;
    } else if (parent.APPLICATION_CONTEXT) {
      _context = parent.APPLICATION_CONTEXT;
    }
    var namespace = _context+"/blog/group/message";
    var action = "/joinGroupMessage.jspx";
    var _url = namespace + action;
    if(isOpen == "Y"){//群组为开放状态
      msgType = 201;//改变消息类型
    }
	$.ajax( {
		type : "POST",
		url : _url,
		data : {
			groupId : groupId,
            groupName: encodeURI(groupName),
            messageType:msgType
		},
		async : true,
		success : function(msg) {
			alert(msg);
		},
		error : function() {
			alert("申请失败！");
		}
	});
}