function $$$(str){ return document.getElementById(str);}
function loadFunction(func){
	var oldfunction=window.onload;
	if(typeof oldfunction!="function"){
		window.onload=func;
	}
	else{
		window.onload=function(){
			oldfunction();
			func();
		}	
	}
}

function sameHeight(){
	if(!$$$("info")||!$$$("right")) return false;
	var numH1=$$$("info").offsetHeight;
	var numH2=$$$("right").offsetHeight;
	var maxHeight=(numH1>numH2)?numH1:numH2;
	$$$("info").style.height=maxHeight-120+"px";
	$$$("right").style.height=maxHeight+"px";
}

function time(){
	var enabled = 0; today = new Date();
	var day;
	var date;
	if(today.getDay()==0) day = " 星期日"
	if(today.getDay()==1) day = " 星期一"
	if(today.getDay()==2) day = " 星期二"
	if(today.getDay()==3) day = " 星期三"
	if(today.getDay()==4) day = " 星期四"
	if(today.getDay()==5) day = " 星期五"
	if(today.getDay()==6) day = " 星期六"
	date = "" + (today.getYear()) + "年" + (today.getMonth() + 1 ) + "月" + today.getDate() + "日" + day +"";
	$$$("show-date").innerHTML=date;
}

function mianNav() {
	if (document.all&&document.getElementById) {
	navRoot = document.getElementById("nav");
		for (i=0; i<navRoot.childNodes.length; i++) {
			node = navRoot.childNodes[i];
			if (node.nodeName=="LI") {
				node.onmouseover=function() {
					this.className+=" over";
 				}
 				node.onmouseout=function() {
 					this.className=this.className.replace(" over", "");
 				}
 			}
 		}
 	}
}

function $$(obj,element){ return document.getElementById(obj).getElementsByTagName(element);}

//根据传递的参数显示不同的图片
function displayWhich(data){
	var btn=$$("linkbtn","a");
	var pic=$$("pic","ul");
	//n=(data>pic.length-1)?0:n;//如果大于最大数组下标，重新开始循环
	
		for(var i=0;i<pic.length;i++){//遍历所有的图片
			if(i==data){
				pic[i].className="block";
				btn[i].className="over";
			}
			else{
				pic[i].className="hidden";
				btn[i].className="";
			}
			
			btn[i].suf=i;//给按钮增加一个属性
			btn[i].onclick=function(){displayWhich(this.suf); n=this.suf+1; return n;}
			btn[i].onmouseover=function(){ clearTimeout(timer);}
			btn[i].onmouseout=function(){ timer=window.setTimeout("auto()",8000);}
			
			pic[i].onmouseover=function(){ clearTimeout(timer);}
			pic[i].onmouseout=function(){ timer=window.setTimeout("auto()",8000);}
		}
	
}

function auto(){
	if(n>1) n=0;
	displayWhich(n);
	n++;
	timer=window.setTimeout("auto()",8000);	
}

var n=0;//全局变量

/*loadFunction(sameHeight);*/
loadFunction(time);
loadFunction(mianNav);