//让图片不变形，修改图片的最大高和宽值

function DrawImage(ImgD, MaxWidth, MaxHeight) {
    ///	<summary>
    ///		让图片不变形，修改图片的最大高和宽值
    ///	</summary>
    ///	<param name="ImgD" type="String">
    /// 图片
    ///	</param>
    ///	<param name="MaxWidth" type="String">
    /// 宽度
    ///	</param>
    ///	<param name="MaxHeight" type="String">
    /// 高度
    ///	</param>
    ///	<returns type="Number" />
var image=new Image(); 
image.src=ImgD.src; 
	if(image.width>0 && image.height>0){ 
		if(image.width/image.height>= MaxWidth/MaxHeight){ 
			
			ImgD.width=MaxWidth; 
			ImgD.height=(image.height*MaxWidth)/image.width; 
			
			//ImgD.alt="点击新窗口中查看大图..."; 
		} 
		else{
			
			ImgD.height=MaxHeight; 
			ImgD.width=(image.width*MaxHeight)/image.height; 
			
			//ImgD.alt="点击新窗口中查看大图..."; 
		} 
	}
}

function zoomimg(o)
{
var zoom=parseInt(o.style.zoom, 10)||100;
zoom+=event.wheelDelta/12;
if (zoom>0) o.style.zoom=zoom+'%';
return false;
}