JS DOM实现鼠标滑动图片效果

<!doctype html>
<meta charset="UTF-8">
<html>
 <head>
 <title>
 鼠标滑过页面自动变大
 </title>
 <link rel="stylesheet" href="styles/reset.css" />
 <link rel="stylesheet" href="styles/slidingdoors.css" />
 <script src="slidlingdoors.js"></script>
 </head>
 <body>
 <div id="container">
 <img src="./images/door1.png"/>
 <img src="./images/door2.png"/>
 <img src="./images/door3.png"/>
 <img src="./images/door4.png"/>
 </div>
 </body>
</html>

slidingdoors.css和reset.css:
#container {
 height: 477px;
 margin: 0 auto;
 border-right: 1px solid #ccc;
 border-bottom: 1px solid #ccc;
 overflow: hidden;
 position: relative;
}

#container img {
 position: absolute;
 display: block;
 left: 0;
 border-left: 1px solid #ccc;
}

/**
 * Eric Meyer's Reset CSS v2.0 (http://meyerweb.com/eric/tools/css/reset/)
 * http://cssreset.com
 */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
 margin: 0;
 padding: 0;
 border: 0;
 font-size: 100%;
 font: inherit;
 vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
 display: block;
}
body {
 line-height: 1;
}
ol, ul {
 list-style: none;
}
blockquote, q {
 quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
 content: '';
 content: none;
}
table {
 border-collapse: collapse;
 border-spacing: 0;
}

window.onload=function(){
 var box=document.getElementById("container");
 var imgs=box.getElementsByTagName("img");
 var imgwidth=imgs[0].offsetWidth;
 var exposewidth=160;
 var boxwidth=imgwidth+exposewidth*(imgs.length-1);
 box.style.width=boxwidth+'px';
 function setImgPos(){
 for(var i=1;i<imgs.length;i++)
 {
 imgs[i].style.left=imgwidth+exposewidth*(i-1)+'px';
 }
 }
 setImgPos();
 var translate=imgwidth-exposewidth;
 for(var i=0;i<imgs.length;i++)
 {
 (function(i){
 imgs[i].onmouseover=function(){
 setImgPos();
 for(var j=1;j<=i;j++)
 {
  imgs[j].style.left=parseInt(imgs[j].style.left,10)-translate+'px';
 }
 };
 })(i);
 }
};