// 说明：用 JavaScript 实现网页图片等比例缩放
function DrawImage(ImgD,FitWidth,FitHeight)
{     
	var image=new Image();
    image.src=ImgD.src;
	if(image.width>0 && image.height>0)
	{         
		if(image.width/image.height>= FitWidth/FitHeight)
		{             
			if(image.width>FitWidth)
			{     ImgD.width=FitWidth;
				  ImgD.height=(image.height*FitWidth)/image.width;             
			}
			else
			{          
				 ImgD.width=image.width;                 
				 ImgD.height=image.height;       
			} 
		} 
		else
		{             
			if(image.height>FitHeight)
			{                 
				ImgD.height=FitHeight;                 
				ImgD.width=(image.width*FitHeight)/image.height;             
			}
			else
			{                 
				ImgD.width=image.width;                 
				ImgD.height=image.height;             
			}         
		}     
	} 
}