IE下 struts中使用滤镜对本地图片进行预览

            function PreviewImg(imgFile,width,height) {
                //IE
                if (window.navigator.userAgent.indexOf("MSIE")>=1){
                    imgFile.select();
                    var imgPath= document.selection.createRange().text;
                    var newPreview= document.getElementById("preview");
                    var regext=/\.jpg$|\.gif$|\.jpeg$|\.png$|\.bmp$/gi;
                   
                    if(!regext.test(imgPath)|| isEmpty(imgPath)){ 
                        alert("对不起，系统仅支持标准格式的照片，请您调整格式后重新上传！");   
                        document.getElementById("upLoadButton").disabled=true;     //把上传按钮置为灰化
                    }else{ 
                        document.getElementById("upLoadButton").disabled=false;//把上传按钮置为有效
                        newPreview.style.filter ="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)"; 
                        newPreview.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src= imgPath;
                        newPreview.style.styleFloat ="right"; 
                        newPreview.style.width = width+"px"; 
                        newPreview.style.height = height+"px";  
                    } 
                }
            }

 

<html:file property="image" name="photoForm"  styleId="pht"  size="40" maxlength="40" onchange="PreviewImg(this,100,120)"/>
<div id="preview" style="border:1px solid black;width:120px;height:150px;text-align: center;">预览</div>

<input type="button" name="up" id="upLoadButton" class="button" value="照片上传" onclick="UP()">