var proMaxHeight = 160;
var proMaxWidth = 113;
 
function proDownImage(ImgD){
    var image=new Image();
    image.src=ImgD.src;
    if(image.width>0 && image.height>0){
   var rate = (proMaxWidth/image.width < proMaxHeight/image.height)?proMaxWidth/image.width:proMaxHeight/image.height;
   if(rate <= 1){   
    ImgD.width = image.width*rate;
    ImgD.height =image.height*rate;
   }
   else {
                        ImgD.width = image.width;
                        ImgD.height =image.height;
                }
    }
}