实现图片预览

下载js插件
<script type="text/javascript" src="${base}/template/common/js/uploadify/uploadPreview.js"></script>
<script type="text/javascript">
    window.onload = function () { 
        new uploadPreview({ UpBtn: "up_img", DivShow: "imgdiv", ImgShow: "imgShow" });
    }

</script>

<div class="mlt" id="imgdiv">产品图片：
	<img id="imgShow" class="tu1" />
</div>
<input type="file" id="up_img" />