使用JS打造动态网站幻灯片效果

<SCRIPT>
var widths=263;              
var heights=326;              
var counts=6;
img1=new Image ();img1.src='/skin/images/lijiang.jpg'; 
img2=new Image ();img2.src='/skin/images/dali.jpg'; 
img3=new Image ();img3.src='/skin/images/ylxs.jpg'; 
img4=new Image ();img4.src='/skin/images/nujiang.jpg';  
img5=new Image ();img5.src='/skin/images/xsbn.jpg'; 
img6=new Image ();img6.src='/skin/images/erhai.jpg';
var nn=1;
var key=0;
function change_img()
{if(key==0){key=1;}
else if(document.all)
{document.getElementById("pic").filters[0].Apply();document.getElementById("pic").filters[0].Play(duration=2);}
eval('document.getElementById("pic").src=img'+nn+'.src');
for (var i=1;i<=counts;i++){document.getElementById("xxjdjj"+i).className='axx';}
document.getElementById("xxjdjj"+nn).className='bxx';
nn++;if(nn>counts){nn=1;}
tt=setTimeout('change_img()',8000);}
function changeimg(n){nn=n;window.clearInterval(tt);change_img();}
document.write('<style>');
document.write('.axx{padding:1px 7px;border-left:cccccc 1px solid;}');
document.write('a.axx:link,a.axx:visited{text-decoration:none;color:fff;line-height:12px;font:11px sans-serif;background-color:666;}');
document.write('a.axx:active,a.axx:hover{text-decoration:none;color:fff;line-height:12px;font:11px sans-serif;background-color:999;}');
document.write('.bxx{padding:1px 7px;border-left:cccccc 1px solid;}');
document.write('a.bxx:link,a.bxx:visited{text-decoration:none;color:fff;line-height:12px;font:11px sans-serif;background-color:D34600;}');
document.write('a.bxx:active,a.bxx:hover{text-decoration:none;color:fff;line-height:12px;font:11px sans-serif;background-color:D34600;}');
document.write('</style>');