window.onload=function(){
  var aDiv=document.getElementsByTagName("div");
  var timer=null;
  var i;
  for(i=0;i<aDiv.length;i++){
    aDiv[i].timer=null;
    aDiv[i].onmouseover=function(){
      startMove(this,300);
    };
    aDiv[i].onmouseout=function(){
      startMove(this,100);
    };
  }
  function startMove(obj,iTarget){
    clearInterval(obj.timer);
    obj.timer=setInterval(function(){
      var iSpeed=(iTarget-obj.offsetWidth)/8;
      iSpeed=iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);  //凡是要用缓冲运动，肯定缺不了取整，为了让他能到目的点（不然无法完全贴合）
      if(obj.offsetWidth==iTarget){
        clearInterval(obj.timer);
      }
      else{
        obj.style.width=obj.offsetWidth+iSpeed+'px';
      }
    },30);
  };
};

window.onload=function(){
  var aDiv=document.getElementsByTagName("div");
  var timer=null;
  aDiv[0].onmouseover=function(){
    startMove(this,'width',300);
  };
  aDiv[0].onmouseout=function(){
    startMove(this,'width',100);
  };
  function getStyle(obj,attr){
    if(obj.currentStyle){
      return obj.currentStyle[attr];
    }
    else{
      return getComputedStyle(obj,false)[attr];
    }
  };
  function startMove(obj,attr,iTarget){
    clearInterval(obj.timer);
    obj.timer=setInterval(function(){
      var iCur=parseInt(getStyle(obj,attr));
      var iSpeed=(iTarget-iCur)/8;
      iSpeed=iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);  //凡是要用缓冲运动，肯定缺不了取整，为了让他能到目的点（不然无法完全贴合）
      if(iCur==iTarget){
        clearInterval(obj.timer);
      }
      else{
        obj.style[attr]=iCur+iSpeed+'px';
      }
    },30);
  };
};

var iCur=parseInt(getStyle(obj,attr));

if(attr=='opacity'){
  var iCur=parseFloat(getStyle(obj,attr))*100;  //为了其他程序不用修改，这里统一乘100
}
else{
  var iCur=parseInt(getStyle(obj,attr));
}

obj.style[attr]=iCur+iSpeed+'px';

aDiv.style.opacity=50px;

if(attr=='opacity'){
  obj.style.filter='alpha(opacity:'+(iCur+iSpeed)+')';
  obj.style.opacity=(iCur+iSpeed)/100;
}
else{
  obj.style[attr]=iCur+iSpeed+'px'
}

var iCur=parseInt(parseFloat(getStyle(obj,attr))*100);