网上下载的代码 放进我的网页里从居中对齐变成做对齐了 调 了好久 不知道怎么办

Question

/* 懒人图库 搜集整理 www.lanrentuku.com */

*{ margin:0; padding:0; list-style:none;}

#divSmallBox{overflow:hidden;*display:inline;*zoom:1;width:10px;height:10px;margin:0 5px;border-radius:10px;background:#ffffff;}

#playBox{ width:1000px; height:409px; margin:20px auto; background:#333; position:relative; overflow:hidden;}

#playBox .oUlplay { width:99999px; position:absolute; left:0; top:0;}

#playBox .oUlplay li{ float:left;}

#playBox .pre{ cursor:pointer; width:45px; height:45px; background:url(../images/l.png) no-repeat; position:absolute; top:190px; left:10px; z-index:10;}

#playBox .next{ cursor:pointer; width:45px; height:45px; background:url(../images/r.png) no-repeat; position:absolute; top:190px; right:10px; z-index:10;}

#playBox .smalltitle {width:1000px; height:10px; position:absolute; bottom:15px; z-index:10}

#playBox .smalltitle ul{ width:120px; margin:0 auto;}

#playBox .smalltitle ul li{ width:10px; height:10px; margin:0 5px; border-radius:10px; background:#ffffff; float:left; overflow:hidden;*display:inline;*zoom:1;}

#playBox .smalltitle .thistitle{ background:#69aaec;}

上面是css样式

function getStyle(obj,name)

{

if(obj.currentStyle)

{

return obj.currentStyle[name]

}

else

{

return getComputedStyle(obj,false)[name]

}

}

function getByClass(oParent,nClass)

{

var eLe = oParent.getElementsByTagName('*');

var aRrent  = [];

for(var i=0; i<eLe.length; i++)

{

if(eLe[i].className == nClass)

{

aRrent.push(eLe[i]);

}

}

return aRrent;

}

function startMove(obj,att,add)

{

clearInterval(obj.timer)

obj.timer = setInterval(function(){

  var cutt = 0 ;

  if(att=='opacity')

  {

  cutt = Math.round(parseFloat(getStyle(obj,att)));

  }

  else

  {

  cutt = Math.round(parseInt(getStyle(obj,att)));

  }

  var speed = (add-cutt)/4;

  speed = speed>0?Math.ceil(speed):Math.floor(speed);

  if(cutt==add)

  {

  clearInterval(obj.timer)

  }

  else

  {

  if(att=='opacity')

  {

  obj.style.opacity = (cutt+speed)/100;

  obj.style.filter = 'alpha(opacity:'+(cutt+speed)+')';

  }

  else

  {

  obj.style[att] = cutt+speed+'px';

  }

  }

  

},30)

}

  window.onload = function()

  {

 var oDiv = document.getElementById('playBox');

 var oPre = getByClass(oDiv,'pre')[0];

 var oNext = getByClass(oDiv,'next')[0];

 var oUlBig = getByClass(oDiv,'oUlplay')[0];

 var aBigLi = oUlBig.getElementsByTagName('li');

 var oDivSmall = getByClass(oDiv,'smalltitle')[0]

 var aLiSmall = oDivSmall.getElementsByTagName('li');

 

 function tab()

 {

    for(var i=0; i<aLiSmall.length; i++)

    {

   aLiSmall[i].className = '';

    }

    aLiSmall[now].className = 'thistitle'

    startMove(oUlBig,'left',-(now*aBigLi[0].offsetWidth))

 }

 var now = 0;

 for(var i=0; i<aLiSmall.length; i++)

 {

 aLiSmall[i].index = i;

 aLiSmall[i].onclick = function()

 {

 now = this.index;

 tab();

 }

}

 oPre.onclick = function()

 {

 now--

 if(now ==-1)

 {

 now = aBigLi.length;

 }

  tab();

 }

  oNext.onclick = function()

 {

  now++

 if(now ==aBigLi.length)

 {

 now = 0;

 }

 tab();

 }

 var timer = setInterval(oNext.onclick,3000) //滚动间隔时间设置

 oDiv.onmouseover = function()

 {

 clearInterval(timer)

 }

  oDiv.onmouseout = function()

 {

 timer = setInterval(oNext.onclick,3000) //滚动间隔时间设置

 }

  }

上面是js代码