//picture constrain narrow
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;
   }
   }
  }
  }