function image_auto_resize(this_s,width,height){ 
 var ta_image = new Image(); 
 ta_image.src = this_s.src; 
  if(!width){this_s.removeAttribute('width'); 
  this_s.style.width='auto';} 
  else if(width < ta_image.width){ 
  this_s.width = width; 
  }else{ 
  this_s.width = ta_image.width; 
  } 
  if(!height){this_s.removeAttribute('height'); 
  this_s.style.height='auto';} 
  else if(height < ta_image.height){ 
  this_s.height = height; 
  }else{ 
  this_s.height = ta_image.height; 
  } 
}