// JavaScript Document

//切换导航栏二级子栏目
function changeNav(n) {
	for(var i=1;i<=13;i++){
		document.getElementById("nav-sub-"+i).style.display="none";
	}
	document.getElementById("nav-sub-"+n).style.display="block";		
}

//提交搜索
function search() {document.searchform.submit();}
function navsearch() {document.navsearchform.submit();}

//更改文章#article-content的字体大小
function changeContentSize(size) {
	document.getElementById('articleContent').style.fontSize = size+'px';
	document.getElementById('articleContent').style.lineHeight = 2.8-size/10;
}
//更换文章背景#article-content的颜色
function changeContentBgColorA() {
	document.getElementById('mainArticleContent').style.backgroundColor ='#FAFBE6';
}
function changeContentBgColorB() {
	document.getElementById('mainArticleContent').style.backgroundColor ='#FFF2E2';
}
function changeContentBgColorC() {
	document.getElementById('mainArticleContent').style.backgroundColor ='#FDE6E0';
}
function changeContentBgColorD() {
	document.getElementById('mainArticleContent').style.backgroundColor ='#F3FFE1';
}
function changeContentBgColorE() {
	document.getElementById('mainArticleContent').style.backgroundColor ='#DAFAFE';
}
function changeContentBgColorF() {
	document.getElementById('mainArticleContent').style.backgroundColor ='#E9EBFE';
}
function changeContentBgColorG() {
	document.getElementById('mainArticleContent').style.backgroundColor ='#EAEAEF';
}
function changeContentBgColorH() {
	document.getElementById('mainArticleContent').style.backgroundColor ='#FFFFFF';
}

function on(){
	ks = document.getElementById("query");
	if (ks.value == "请输入关键字") ks.value = "";
	return false;
}

function off(){
	ks = document.getElementById("query");
	if (ks.value == "") ks.value = "请输入关键字";
	return false;
}