var flag=false; 
function DrawImage400_300(ImgD){ 
 var image=new Image(); 
 image.src=ImgD.src; 
 if(image.width>0 && image.height>0){ 
  flag=true; 
  if(image.width/image.height>= 400/300){ 
   if(image.width>400){
    ImgD.width=400; 
    ImgD.height=(image.height*400)/image.width; 
   }else{ 
    ImgD.width=image.width;
    ImgD.height=image.height; 
   } 
   ImgD.alt=ImgD.alt;
  } 
  else{ 
   if(image.height>300){
    ImgD.height=300; 
    ImgD.width=(image.width*300)/image.height; 
   }else{ 
    ImgD.width=image.width;
    ImgD.height=image.height; 
   } 
   ImgD.alt=ImgD.alt; 
  } 
 }
}