var tc;
var t


function init_scrop (o){
   hscroll(o);
   t=window.setInterval(function(){window.clearTimeout(tc);o.firstChild.style.marginLeft='0px';scrollup(o,173,0);},4000);//50 单个滚动时间 000 单个滚动间隔时间
   
   }
function scrollup(o,d,c){
     if(d==c){
         var t=o.firstChild.cloneNode(true);
         o.removeChild(o.firstChild);
         o.appendChild(t);
         t.style.marginLeft='0px';
         o.firstChild.style.marginLeft='0px'
         hscroll(o);
     }
     else{
         ch=false;var s=5,c=c+s,l=(c>=d?c-d:0);
         o.firstChild.style.marginLeft=-c+l+'px';
         window.setTimeout(function(){scrollup(o,d,c-l)},50);
     }
}

function hscroll(o){
     var w1=o.firstChild.offsetWidth,w2=o.offsetWidth;
     if(w1<=w2)return;
     tc=window.setTimeout(function(){hs(o,w1-w2,0,w1-w2)},3500);
}

function hs(o,d,c,p){
     c++;var t=(c>0?-c:c);o.firstChild.style.marginLeft=t+'px';
     if(c==d){if(d==0){tc=window.setTimeout(function(){hs(o,p,0,p)},2500);}else tc=window.setTimeout(function(){hs(o,0,-p,p)},3500);}
     else tc=window.setTimeout(function(){hs(o,d,c,p)},5);
}