code: function(s) {
  		var n = 1, u = 'b';
  		
  		if (s == 'unknown') {
  			return this.i18n('unknown');
  		}
  		
  		if (s > 1073741824) {
  			n = 1073741824;
  			u = 'GB';
  		} else if (s > 1048576) {
  			n = 1048576;
  			u = 'MB';
  		} else if (s > 1024) {
  			n = 1024;
  			u = 'KB';
  		}
  		s = s/n;
  		return (s > 0 ? n >= 1048576 ? s.toFixed(2) : Math.round(s) : 0) +' '+u;
  	}
docs: Return formated file size
  
  @param  Number  file size
  @return String