How to jump the top of div (ajax)

You will need to edit the ultimate-wp-query-search-filter/trunk/classes/scripts/uwpqsfscript.js .
Either in this event:

$('body').on('click','.upagievent', function(e) {
			var pagenumber =  $(this).attr('id');
			var formid = $('#curuform').val();
			upagi_ajax(pagenumber, formid);
			return false;
		});

or

window.upagi_ajax = function (pagenum, formid) {
			var ajxdiv = $(''+formid+'').find("#uajaxdiv").val();	
			var res = {loader:$('<div />',{'class':'umloading'}),container : $(''+ajxdiv+'')};
			var getdata = $(''+formid+'').serialize();
		
			jQuery.ajax({
				 type: 'POST',	 
				 url: ajax.url,
				 data: ({action : 'uwpqsf_ajax',getdata:getdata, pagenum:pagenum }),
				 beforeSend:function() {$(''+ajxdiv+'').empty(); res.container.append(res.loader);},
				 success: function(html) {
				  res.container.find(res.loader).remove();
				  $(''+ajxdiv+'').html(html);
				
				//res.container.find(res.loader).remove();
				 }
				 });
		}

You can add scrolling animation to the div after the click on the pagination. Eg:
$("html, body").animate({ scrollTop: $("#toTHIS").offset().top }, 500);