选中图片，即时显示

function preview(fileid,vid)
    { 
        var x = document.getElementById(fileid);
         if(!x || !x.value)
          return;
           var patn = /\.jpg$|\.jpeg$|\.bmp$|\.gif$/i;
             if(patn.test(x.value))
             {   
                 var d = document.getElementById(vid);
                 d.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = 'file://localhost/'+x.value;
                 d.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = 'scale';
             }
        else{ 
          alert("您选择的似乎不是图像文件。"); 
          }
      }


   <h5 id="d2" style="border-right: black 1px solid; border-top: black 1px solid; filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);
                                border-left: black 1px solid; width: 60px; border-bottom: black 1px solid; height: 100px">
                            </h5>
                            <input id="myFile2" runat="server" name="myFile1" onchange="preview('myFile2','d2')"
                                type="file" style="width: 145px" />