code: function scrollableElement(els) {
  	for (var i = 0, argLength = arguments.length; i <argLength; i++) {
  		var el = arguments[i],
  		$scrollElement = $(el);
  		if ($scrollElement.scrollTop()> 0) {
  			return el;
  		} else {
  			$scrollElement.scrollTop(1);
  			var isScrollable = $scrollElement.scrollTop()> 0;
  			$scrollElement.scrollTop(0);
  			if (isScrollable) {
  				return el;
  			}
  		}
  	}
  	return [];
  }
docs: use the first element that is "scrollable"