关于上传预览的问题

<script language="javascript" type="text/javascript">
    var flag = false;
    function DrawImage(ImgD) {
        var image = new Image();
        image.src = ImgD.src;
        if (image.width > 0 && image.height > 0) {
            flag = true;
            if (image.width / image.height >= 110 / 150) {
                if (image.width > 110) {
                    ImgD.width = 110;
                    ImgD.height = (image.height * 110) / image.width;
                } else {
                    ImgD.width = image.width;
                    ImgD.height = image.height;
                }
                ImgD.alt = image.width + "×" + image.height;
            }
            else {
                if (image.height > 150) {
                    ImgD.height = 150;
                    ImgD.width = (image.width * 150) / image.height;
                } else {
                    ImgD.width = image.width;
                    ImgD.height = image.height;
                }
                ImgD.alt = image.width + "×" + image.height;
            }
        }
        /**//**//**//*else{
    ImgD.src="";
    ImgD.alt=""
    }*/
    }    function FileChange(Value) {
        flag = false;
        document.all.uploadimage.width = 10;
        document.all.uploadimage.height = 10;
        document.all.uploadimage.alt = "";
        document.all.uploadimage.src = Value;
    }
</script><div class="p5 border1"><img id="uploadimage" height="10" width="10" src onload="javascript:DrawImage(this);" alt="头像" /></div>
            <div class="mb"><asp:FileUpload ID="FileUpload" runat="server" onchange="javascript:FileChange(this.value);" Width="143px"/></div>
请高手帮忙改一下让他兼容火狐和IE8.通用最好了.目前只支持IE6.360