function isScrolledIntoView(elem)
{
    var docViewTop = jQuery(window).scrollTop();
    var docViewBottom = docViewTop + jQuery(window).height();

    var elemTop = jQuery(elem).offset().top;
    var elemBottom = elemTop + jQuery(elem).height();

    return (
        (elemTop <= docViewBottom) && (elemTop >= docViewTop) ||
        (elemBottom <= docViewBottom) && (elemBottom >= docViewTop)
    );
}
jQuery('#our_a_top').html('<!-- Yandex.RTB R-A-645045-1 --><div id="yandex_rtb_R-A-645045-1"></div>');function renderATop()
{
	window.yaContextCb.push(()=>{
		Ya.Context.AdvManager.render({
			blockId: "R-A-645045-1",
			renderTo: "yandex_rtb_R-A-645045-1"
		})
	});
}

renderATop();

setInterval(function(){
    if (isScrolledIntoView('#yandex_rtb_R-A-645045-1')) {
        console.log('Reload top block');
        renderATop();
    }
}, 30000);