function DrawImage(ImgD,FitWidth,FitHeight)
{
var flag=false; 
 var image=new Image();
  image.src=ImgD.src;
	if(image.width>0 && image.height>0)
	{
	flag=true;
	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;
	}
	ImgD.alt="点击图片查看详细情况("+image.width+"×"+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;      
	}      
 ImgD.alt="点击图片查看详细情况("+image.width+"×"+image.height+")";      
   }     
  } 
}