action only if at top of page

Hi, I have this code that works great, but I only want it to happen if the page is scrolled all the way at the top. Is there something I can add to it to make it only work if the the page is scrolled all the way up?

var top1 = jQuery(window).scrollTop() ;
if(top1 > 200)
{
	jQuery('html, body').animate({ scrollTop: 0 }, '1000');

}
else{
	jQuery('html,body').animate({
		scrollTop: jQuery('.content_wrapper').offset().top
	}, 1000);
}

It’s on this page (https://w-ard.com/portfolio/tnt2/), when you click on the plus sign at the bottom this code is used to scroll the page down automatically, but if you’re already scrolled down it causes issues.