(function() {



function $(id) {

	return document.getElementById(id);

}



function setStyleDisplay(id, status) {

	$(id).style.display = status;

}



function goTop(a, t) {

	a = a || 0.5;

	t = t || 8;



	var x1 = 0;

	var y1 = 0;

	var x2 = 0;

	var y2 = 0;

	var x3 = 0;

	var y3 = 0;



	if (document.documentElement) {

		x1 = document.documentElement.scrollLeft || 0;

		y1 = document.documentElement.scrollTop || 0;

	}

	if (document.body) {

		x2 = document.body.scrollLeft || 0;

		y2 = document.body.scrollTop || 0;

	}

	var x3 = window.scrollX || 0;

	var y3 = window.scrollY || 0;



	var x = Math.max(x1, Math.max(x2, x3));

	var y = Math.max(y1, Math.max(y2, y3));



	var speed = 1 + a;

	window.scrollTo(Math.floor(x / speed), Math.floor(y / speed));

	if(x > 0 || y > 0) {

		var f = "MGJS.goTop(" + a + ", " + t + ")";

		window.setTimeout(f, t);

	}

}



function switchTab(showPanels, hidePanels, activeTab, activeClass, fadeTab, fadeClass) {

	$(activeTab).className = activeClass;

	$(fadeTab).className = fadeClass;



	var panel, panelList;

	panelList = showPanels.split(',');

	for (var i = 0; i < panelList.length; i++) {

		var panel = panelList[i];

		if ($(panel)) {

			setStyleDisplay(panel, 'block');

		}

	}

	panelList = hidePanels.split(',');

	for (var i = 0; i < panelList.length; i++) {

		panel = panelList[i];

		if ($(panel)) {

			setStyleDisplay(panel, 'none');

		}

	}

}



function loadCommentShortcut() {

	$('comment').onkeydown = function (moz_ev) {

		var ev = null;

		if (window.event){

			ev = window.event;

		} else {

			ev = moz_ev;

		}

		if (ev != null && ev.ctrlKey && ev.keyCode == 13) {

			$('submit').click();

		}

	}

	$('submit').value += ' (Ctrl+Enter)';

}



function getElementsByClassName(className, tag, parent) {

	parent = parent || document;



	var allTags = (tag == '*' && parent.all) ? parent.all : parent.getElementsByTagName(tag);

	var matchingElements = new Array();



	className = className.replace(/\-/g, '\\-');

	var regex = new RegExp('(^|\\s)' + className + '(\\s|$)');



	var element;

	for (var i = 0; i < allTags.length; i++) {

		element = allTags[i];

		if (regex.test(element.className)) {

			matchingElements.push(element);

		}

	}



	return matchingElements;

}



window['MGJS'] = {};

window['MGJS']['$'] = $;

window['MGJS']['setStyleDisplay'] = setStyleDisplay;

window['MGJS']['goTop'] = goTop;

window['MGJS']['switchTab'] = switchTab;

window['MGJS']['loadCommentShortcut'] = loadCommentShortcut;

window['MGJS']['getElementsByClassName'] = getElementsByClassName;



})();

$(document).ready(function() {   //开始

if($('input#author[value]').length>0){   //判断用户框是否有值

$("#author_info").css('display','none');   //将id为author_info的对象的display属性设为none，即隐藏

var change='<span  id="show_author_info" style="cursor: pointer; color:#2970A6;">更改 &raquo;</span>';  //定义change，style是定义CSS样式，让他有超链接的效果，color要根据你自己的来改，当然你也可以在CSS中定义#show_author_info来实现，这样是为了不用再去修改style.css而已！

var close='<span  id="hide_author_info" style="cursor: pointer;color: #2970A6;">关闭 &raquo;</span>';   //定义close

$('#welcome').append(change);   //在ID为welcome的对象里添加刚刚定义的change

$('#welcome').append(close);    // 添加close

$('#hide_author_info').css('display','none');   //隐藏close

$('#show_author_info').click(function() {   //鼠标点击change时发生的事件

$('#author_info').slideDown(300)   //用户输入框向下滑出

$('#show_author_info').css('display','none');   //隐藏change

$('#hide_author_info').css('display','inline');  //显示close

$('#hide_author_info').click(function() {  // 鼠标点击close时发生的事件

$('#author_info').slideUp(300)    //用户输入框向上滑

$('#hide_author_info').css('display','none');  //隐藏close

$('#show_author_info').css('display','inline'); })})}})  //显示change