FileUpload上传图片(图片不变形)

<style type="text/css"> 
#newPreview 
{ 
filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=images); 
} 
</style> 
<script type="text/javascript" language="javascript"> 
function PreviewImg(imgFile) 
{ 
var newPreview = document.getElementById("newPreview"); 

newPreview.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgFile.value; 

newPreview.style.width = newPreview.offsetWidth /2;
 

newPreview.style.height = newPreview.offsetHeight / 2;
 

newPreview.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = 'scale'; 
} 
</script>

请选择一个图片进行预览：

<input type="file" size="20" onchange="javascript:PreviewImg(this);" /> 
<div id="newPreview"></div>