// 显示下拉菜单（导航）MM_findObj(n, d) MM_showHideLayers()
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_showHideLayers() { //v6.0
	var i,p,v,obj,args=MM_showHideLayers.arguments;
	for (i=0; i<(args.length-2); i+=3)
	{
		if ((obj=MM_findObj(args[i]))!=null)
		{
			v=args[i+2];
			if (obj.style)
			{
				obj=obj.style;
				v=(v=='show')?'visible':(v=='hide')?'hidden':v;
			}
			if(v=='visible')
				obj.display="block";
			else
				obj.display="none";
			obj.visibility=v;
		}
	}
}


function checkall(form, prefix, checkall)
{
	var checkall = checkall ? checkall : 'chkall';
	for(var i = 0; i < form.elements.length; i++) {
		var e = form.elements[i];
		if(e.name != checkall && (!prefix || (prefix && e.name.match(prefix)))) {
			e.checked = form.elements(checkall).checked;;
		}
	}
}


// 字体
function doZoom(size){
	document.getElementById('zoom').style.fontSize=size+'px'
}

// js实现不变形的自动缩略图效果-支持FF
function DrawImage(ImgD,imageWidth,imageHeight)
{
	var image=new Image();
	image.src=ImgD.src;
	if(image.width>0 && image.height>0)
	{
		flag=true;
		if(image.width/image.height>= imageWidth/imageHeight)
		{
			if(image.width>imageWidth)
			{
				ImgD.width=imageWidth;
				ImgD.height=(image.height*imageWidth)/image.width;
			}
			else
			{
				ImgD.width=image.width;
				ImgD.height=image.height;
			}
		}
		else
		{
			if(image.height>imageHeight)
			{
				ImgD.height=imageHeight;
				ImgD.width=(image.width*imageHeight)/image.height;
			}
			else
			{
				ImgD.width=image.width;
				ImgD.height=image.height;
			}
		}
	}
}

/******************************************************
	startmarquee(lh,speed,delay,index) 不间断向上滚动
	lh: 一次滚动高度,
	speed: 速度,
	delay: 停留时间,
	index: 图层标记ID, id命名要以marqueebox开头，形式：marqueebox+ID);
******************************************************/
function startmarquee(lh,speed,delay,index){ 
var t; 
var p=false; 
var o=document.getElementById("marqueebox"+index); 
o.innerHTML+=o.innerHTML; 
o.onmouseover=function(){p=true} 
o.onmouseout=function(){p=false} 
o.scrollTop = 0; 
function start(){ 
t=setInterval(scrolling,speed); 
if(!p) o.scrollTop += 2; 
} 
function scrolling(){ 
if(o.scrollTop%lh!=0){ 
o.scrollTop += 2; 
if(o.scrollTop>=o.scrollHeight/2) o.scrollTop = 0; 
}else{ 
clearInterval(t); 
setTimeout(start,delay); 
} 
} 
setTimeout(start,delay); 
} 
/*======================================
	焦点轮换JS函数
	power by: http://www.runideas.cn
========================================*/
//主函数
var s=function(){
var interv=3000; //切换间隔时间
var interv2=20; //切换速速
var opac1=80; //文字背景的透明度
var source="fade_focus" //焦点轮换图片容器的id名称
//获取对象
function getTag(tag,obj){if(obj==null){return document.getElementsByTagName(tag)}else{return obj.getElementsByTagName(tag)}}
function getid(id){return document.getElementById(id)};
var opac=0,j=0,t=63,num,scton=0,timer,timer2,timer3;var id=getid(source);id.removeChild(getTag("div",id)[0]);var li=getTag("li",id);var div=document.createElement("div");var title=document.createElement("div");var span=document.createElement("span");var button=document.createElement("div");button.className="button";for(var i=0;i<li.length;i++){var a=document.createElement("a");a.innerHTML=i+1;a.onclick=function(){clearTimeout(timer);clearTimeout(timer2);clearTimeout(timer3);j=parseInt(this.innerHTML)-1;scton=0;t=63;opac=0;fadeon();};a.className="b1";a.onmouseover=function(){this.className="b2"};a.onmouseout=function(){this.className="b1";sc(j)};button.appendChild(a);}
//控制图层透明度
function alpha(obj,n){if(document.all){obj.style.filter="alpha(opacity="+n+")";}else{obj.style.opacity=(n/90);}}
//控制焦点按钮
function sc(n){for(var i=0;i<li.length;i++){button.childNodes[i].className="b1"};button.childNodes[n].className="b2";}
title.className="num_list";title.appendChild(span);alpha(title,opac1);id.className="d1";div.className="d2";id.appendChild(div);id.appendChild(title);id.appendChild(button);
//渐显
var fadeon=function(){opac+=5;div.innerHTML=li[j].innerHTML;span.innerHTML=getTag("img",li[j])[0].alt;alpha(div,opac);if(scton==0){sc(j);num=-2;scrolltxt();scton=1};if(opac<90){timer=setTimeout(fadeon,interv2)}else{timer2=setTimeout(fadeout,interv);};}
//渐隐
var fadeout=function(){opac-=5;div.innerHTML=li[j].innerHTML;alpha(div,opac);if(scton==0){num=2;scrolltxt();scton=1};if(opac>0){timer=setTimeout(fadeout,interv2)}else{if(j<li.length-1){j++}else{j=0};fadeon()};}
//滚动文字
var scrolltxt=function(){t+=num;span.style.marginTop=t+"px";if(num<0&&t>3){timer3=setTimeout(scrolltxt,interv2)}else if(num>0&&t<62){timer3=setTimeout(scrolltxt,interv2)}else{scton=0}};
fadeon();
}