On scroll line draw and addClass selected sections

//on scroll line draw and specific section addClass
//JS
	$j(window).scroll(function(){
		var scrolltop = $j(window).scrollTop();
		if(scrolltop > 50){
			$j('.line').height(scrolltop+110);
		}else{
			$j('.line').height(scrolltop-110);
		}
		if(isInViewport('#services') || isInViewport('#casestudies')){
				$j('.line').addClass('white')
		}else{
			$j('.line').removeClass('white')
		}
	})