js图片幻灯片模式切换代码

<style type="text/css">
.picshow {
	z-index:444;
	position:relative;
	background-color:#e4f2fa;
	width: 100%;
	height: 250px
}
.picshow_main {
	position: relative;
	width: 690px;
	height: 500px;
}
.picshow_main .imgbig {
filter: progid:dximagetransform.microsoft.wipe(gradientsize=1.0, wipestyle=4, motion=forward);
	width: 690px;
	height: 500px;
} /*图片width要和picshow_main的相同即可*/
.picshow_change {
	position: absolute;
	text-align: left;
	bottom: 0px;
	height: 30px;
	right: 0px;
	left: 600px;
}
.picshow_change img {
	width:15px;
	height: 15px
}
.picshow_change a {
	border: 1px solid;
	display: block;
	float: left;
	margin-right: 5px;
	-display: inline
}
a.axx {
	border-color: #555
}
a.axx:hover {
	border-color: #000
}
a.axx img {
	filter: alpha(opacity=40);
	opacity: 0.4;
	-moz-opacity: 0.4
}
a.axx:hover img {
	filter: alpha(opacity=100);
	opacity: 1.0;
	-moz-opacity: 1.0
}
a.bxx {
	border-color: #000
}
a.bxx:hover {
	border-color: #000
}
img {
	border:0px
}
</style>
<SCRIPT language=javascript> 
 //图片滚动展示 Start
 var counts = 3;
 //大图,轮流播放的图片的路径
 img1 = new Image();
 img1.src = '../down/upload/1.jpg';
 img2 = new Image();
 img2.src = '../down/upload/2.jpg';
 img3 = new Image();
 img3.src = '../down/upload/3.jpg';
 
 var smallImg = new Array();
 //小图,右下角的1,2,3
 smallImg[0] = 'http://images1.www.net.cn/static/images/index_adb1.gif';
 smallImg[1] = 'http://images1.www.net.cn/static/images/index_adb2.gif';
 smallImg[2] = 'http://images1.www.net.cn/static/images/index_adb3.gif';
 
 //链接地址
 url1 = new Image();
 url1.src = 'http://www.baidu.cn'; //图片的链接
 url2 = new Image();
 url2.src = 'http://www.google.cn';
 url3 = new Image();
 url3.src = 'http://www.sina.cn';
 //alt值
 alt1 = new Image();
 alt1.alt = '鼠标滑过的文字1'; //鼠标滑过图片的文字
 alt2 = new Image();
 alt2.alt = '鼠标滑过的文字2';
 alt3 = new Image();
 alt3.alt = '鼠标滑过的文字3';
 ////欢迎来到标准之路.
 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');
  eval('document.getElementById("url").href=url' + nn + '.src');
  eval('document.getElementById("pic").alt=alt' + nn + '.alt');
  if (nn == 1) {
   document.getElementById("url").target = "_blank";
   document.getElementById("url").style.cursor = "pointer";
  } else {
   document.getElementById("url").target = "_blank"
   document.getElementById("url").style.cursor = "pointer"
  }
 
  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()', 7000);
 }
 function changeimg(n) {
  nn = n;
  window.clearInterval(tt);
  change_img();
 }
 function ImageShow() {
  document.write('<div class="picshow_main">');
  document.write('<div><a id="url"><img id="pic" class="imgbig" /></a></div>');
  document.write('<div class="picshow_change">');
  for ( var i = 0; i < counts; i++) {
   document.write('<a href="javascript:changeimg(' + (i + 1)
     + ');" id="xxjdjj' + (i + 1)
     + '" class="axx" target="_self"><img src="' + smallImg[i]
     + '"></a>');
  }
  document.write('</div></div>');
  change_img();
 }
 //图片滚动展示 End
</SCRIPT>
<SCRIPT language="javascript" type="text/javascript"> 
 ImageShow();
</SCRIPT>