function Next(slideid){ 
	var marquePic1=document.getElementById("marquePic"+slideid);
	var demo=document.getElementById("demo"+slideid); 
	var skipLen=96;
	
  if(demo.scrollTop>=marquePic1.scrollHeight-3*skipLen-4)    { 
      alert("已到底了");
  } else { 
      demo.scrollTop=demo.scrollTop+skipLen;
  }
  var imgs=marquePic1.getElementsByTagName("div");
  for(var i=0;i<imgs.length;i++) {
     imgs[i].style.border=0;
  }
} 
function Pre(slideid) {
	var marquePic1=document.getElementById("marquePic"+slideid);
	var demo=document.getElementById("demo"+slideid); 
	var skipLen=96;

  var imgs=marquePic1.getElementsByTagName("img");
  for(var i=0;i<imgs.length;i++) {
     imgs[i].style.border=0;
  }

     if(demo.scrollTop>0) { 
        demo.scrollTop=demo.scrollTop-skipLen;        
    } else { 
        alert("已到顶了");
    }
}

function ClickImg(slideid,imgid){ 
	var marquePic1=document.getElementById("marquePic"+slideid);
	var imgs=marquePic1.getElementsByTagName("div");

  for(var i=0;i<imgs.length;i++) { 
  	if(imgs[i].id != imgid)
     	imgs[i].style.border=0;
  }
   
   var img=document.getElementById(imgid);
   var divimg= document.getElementById("div"+imgid);
    document.getElementById("bigimg"+slideid).src=img.src.replace(/\/files_small\//ig,"/files_large/");
	document.getElementById("biga"+slideid).href=img.src.replace(/\/files_small\//ig,"/files/");
   divimg.style.border="4px solid #CFC9EB";
}