[mylifegod]

последний вариант кода: может кому пригодиться.

$(function () {
  
  var getCookie=function(e){var o=document.cookie.match(new RegExp("(?:^|; )"+e.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g,"\\$1")+"=([^;]*)"));return o?decodeURIComponent(o[1]):void 0};
  var setCookie=function(e,o,r){r=r||{};var i=r.expires;if("number"==typeof i&&i){var t=new Date;t.setTime(t.getTime()+1e3*i),i=r.expires=t}i&&i.toUTCString&&(r.expires=i.toUTCString()),o=encodeURIComponent(o);var n=e+"="+o;for(var a in r){n+="; "+a;var v=r[a];v!==!0&&(n+="="+v)}document.cookie=n};
  
  
	$(document).scrollTop(1);
  var temp1 = getCookie("lapa-slider-first-set");
  if(temp1 != 1) {
	$("#bigslider").animate({height: "show"}, 500);
 setCookie("lapa-slider-first-set", "1", {expires: 86400 * 90});
  }
  
  
  
 
  
  var firstScroll = 0;
  $(document).scroll(function() {
    var oy = $(document).scrollTop();
    
    if(oy == 0) {
      $(document).scrollTop(1);
      return;
    }
    
    if(firstScroll == 2) {
      if(oy > 1) {
        firstScroll = 0;
        $(document).scrollTop(1);
        $("#bigslider").animate({height: "hide"}, 500);
        
      }
        
      return;
    }
    
    if(oy > 1) {
      firstScroll = 0;
      return;
    }
    
    if(firstScroll == 0) {
      firstScroll = 1;
      return;
    }
    
    firstScroll = 2;
    $("#bigslider").animate({height: "show"}, 500);
  });
  
});