//下面用于多图片上传预览功能
function setImagePreviews(avalue) {
	var docObj = document.getElementById("doc");
	var dd = document.getElementById("dd");
	dd.innerHTML = "";
	var fileList = docObj.files;
	for (var i = 0; i < fileList.length; i++) {
		dd.innerHTML += "<div   id="vgwymdcbaa"    style='float:left' > <img id='img" + i + "'  /> </div>";
		var imgObjPreview = document.getElementById("img"+i);
		if (docObj.files && docObj.files[i]) {
			//火狐下，直接设img属性
			imgObjPreview.style.display = 'block';
			imgObjPreview.style.width = '90%';
			imgObjPreview.style.height = '31%';
			imgObjPreview.style.top = '57px';
			imgObjPreview.style.left = '30px';
			imgObjPreview.style.position = 'absolute';
			//imgObjPreview.src = docObj.files[0].getAsDataURL();
			//火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式
			imgObjPreview.src = window.URL.createObjectURL(docObj.files[i]);
		}else {
			//IE下，使用滤镜
			docObj.select();
			var imgSrc = document.selection.createRange().text;
			alert(imgSrc)
			var localImagId = document.getElementById("img" + i);
			//必须设置初始大小
			imgObjPreview.style.width = '90%';
			imgObjPreview.style.height = '31%';
			//图片异常的捕捉，防止用户修改后缀来伪造图片
			try {
				localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
				localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
			}
			catch (e) {
				alert("您上传的图片格式不正确，请重新选择!");
				return false;
			}
			imgObjPreview.style.display = 'none';
			document.selection.empty();
		}
	}
	return true;
}