var times=3000;//图片变换间隔毫秒
var og_vtime;
var og_vtime=setTimeout('OG_Asg('+ac+')',times);//启动时间
var og_kaiguan=true;
var opic=520;
document.getElementById("demo").innerHTML="<li></li>"+document.getElementById("demo").innerHTML+"<li>"+document.getElementById("demo").children[0].innerHTML+"</li>"
var tpic=opic*(document.getElementById("demo").children.length-2);//3总5
var fpic=opic*(document.getElementById("demo").children.length-1);//4总5
var ac=opic;
document.getElementById("demo").style.width=document.getElementById("demo").children.length*opic+"px";

function OG_Msg(c){
a=document.getElementById("demo").offsetLeft-document.getElementById("demo").parentNode.offsetLeft;
c=event.currentTarget.innerHTML*opic;
for(i=0;i<event.currentTarget.parentNode.children.length;i++){
   event.currentTarget.parentNode.children[i].className=i==(event.currentTarget.innerHTML-1)?"active":""; 
}
if(og_kaiguan==true){
ac=c;
if (c>-a){OG_Tsg(c)}
if (c<-a){OG_Rsg(c)}
}
}//判断往左边还是往右边移动

function OG_Asg(c){
clearTimeout(og_vtime);
if(og_kaiguan==true){
if(c<fpic){
ac=ac+opic;
var now_i_e;
if((document.getElementById("demo").offsetLeft-document.getElementById("demo").parentNode.offsetLeft)/-opic+1>document.getElementById("demo").children.length-2){
now_i_e=1;
}else{
now_i_e=(document.getElementById("demo").offsetLeft-document.getElementById("demo").parentNode.offsetLeft)/-opic+1;
}
for(i=0;i<document.getElementById('index_og_a').children.length;i++){
document.getElementById('index_og_a').children[i].className=i==(now_i_e-1)?"active":"";
}//*/
OG_Tsg(ac);
}else{
document.getElementById('demo').style.marginLeft  =-opic+'px';
ac=opic;

og_vtime=setTimeout('OG_Asg('+ac+')',100);
}
}
}//定时轮播*/

function OG_Tsg(c){
clearTimeout(og_vtime);
a=document.getElementById("demo").offsetLeft-document.getElementById("demo").parentNode.offsetLeft;

if (c>-a){
og_kaiguan=false;
a-=24.5;
document.getElementById('demo').style.marginLeft  =a+'px';
t=setTimeout("OG_Tsg('"+c+"')",20);
}else{
clearTimeout(t);
if(c==fpic){c=opic;ac=c}
document.getElementById('demo').style.marginLeft  =-c+'px';
og_kaiguan=true;
}

og_vtime=setTimeout("OG_Asg('"+c+"')",times);
}//当请求页面比目前页面左，向左走到请求页面*/

function OG_Rsg(c){
clearTimeout(og_vtime)
a=document.getElementById("demo").offsetLeft-document.getElementById("demo").parentNode.offsetLeft;
if(c<-a){
og_kaiguan=false
a+=24.5;
document.getElementById('demo').style.marginLeft  =a+'px';
t=setTimeout("OG_Rsg('"+c+"')",20)
}else{
clearTimeout(t)
if(c==0){c=tpic;ac=c}
document.getElementById('demo').style.marginLeft  =-c+'px';
og_kaiguan=true
}

og_vtime=setTimeout("OG_Asg('"+c+"')",times)
}//当请求页面比目前页面右，向右走到请求页面*/