$(document).ready(function() {
 // hides the slickbox on clicking the noted link  
  $('.close_bt').click(function() {
    $('#content_single').slideUp();
	//this sends your view to the top (uses JQ)
	$( 'html, body' ).animate( { scrollTop: 0 }, 0 );
    return false;
  });
});


<!--portfolio single - last items css selectors-->
$(document).ready(function() {
	$('body.single-portfolio div.item:nth-child(4n+5)').addClass('last_item');
	$('body.single-portfolio div.item:last').addClass('last_item_bt');
	$('body.single-portfolio div.item:last').prev().addClass('last_item_bt');
	$('body.single-portfolio div.item:last').prev().prev().prev().addClass('last_item_bt');
	});

<!--portfolio main - last items css selectors-->
$(document).ready(function() {
	$('body.page-id-11 div.item:nth-child(4n+5)').addClass('last_item');
	$('body.page-id-11 div.item:last').addClass('last_item_bt');
	$('body.page-id-11 div.item:last').prev().addClass('last_item_bt');
	$('body.page-id-11 div.item:last').prev().prev().prev().addClass('last_item_bt');
	});