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_left_desktop').html('<!-- Veasy_pravo --><!-- Yandex.RTB R-A-645045-4 --><div id="yandex_rtb_R-A-645045-4"></div>');
function renderALeftOrMobileBottom()
{
	window.yaContextCb.push(()=>{
		Ya.Context.AdvManager.render({
			blockId: "R-A-645045-4",
			renderTo: "yandex_rtb_R-A-645045-4"
		})
	});
}

renderALeftOrMobileBottom();

setInterval(function(){
    if (isScrolledIntoView('#yandex_rtb_R-A-645045-4')) {
        console.log('Reload left or mobile bottom block');
        renderALeftOrMobileBottom();
    }
}, 30000);