$(document).ready(function() {
 $('.BTT').click(function(){$('#pageTop').ScrollTo(800);return false});
});

// 스르륵 스르륵 스르륵 스크롤 함수
jQuery.getPos = function (e)
{
 var l = 0;
 var t  = 0;
 var w = jQuery.intval(jQuery.css(e,'width'));
 var h = jQuery.intval(jQuery.css(e,'height'));
 var wb = e.offsetWidth;
 var hb = e.offsetHeight;
 while (e.offsetParent){
  l += e.offsetLeft + (e.currentStyle?jQuery.intval(e.currentStyle.borderLeftWidth):0);
  t += e.offsetTop  + (e.currentStyle?jQuery.intval(e.currentStyle.borderTopWidth):0);
  e = e.offsetParent;
 }
 l += e.offsetLeft + (e.currentStyle?jQuery.intval(e.currentStyle.borderLeftWidth):0);
 t  += e.offsetTop  + (e.currentStyle?jQuery.intval(e.currentStyle.borderTopWidth):0);
 return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
};
jQuery.getClient = function(e)
{
 if (e) {
  w = e.clientWidth;
  h = e.clientHeight;
 } else {
  w = (window.innerWidth) ? window.innerWidth : (document.documentElement && document.documentElement.clientWidth) ? document.documentElement.clientWidth : document.body.offsetWidth;
  h = (window.innerHeight) ? window.innerHeight : (document.documentElement && document.documentElement.clientHeight) ? document.documentElement.clientHeight : document.body.offsetHeight;
 }
 return {w:w,h:h};
};
jQuery.getScroll = function (e)
{
 if (e) {
  t = e.scrollTop;
  l = e.scrollLeft;
  w = e.scrollWidth;
  h = e.scrollHeight;
 } else  {
  if (document.documentElement && document.documentElement.scrollTop) {
   t = document.documentElement.scrollTop;
   l = document.documentElement.scrollLeft;
   w = document.documentElement.scrollWidth;
   h = document.documentElement.scrollHeight;
  } else if (document.body) {
   t = document.body.scrollTop;
   l = document.body.scrollLeft;
   w = document.body.scrollWidth;
   h = document.body.scrollHeight;
  }
 }
 return { t: t, l: l, w: w, h: h };
};

jQuery.intval = function (v)
{
 v = parseInt(v);
 return isNaN(v) ? 0 : v;
};

jQuery.fn.ScrollTo = function(s) {
 o = jQuery.speed(s);
 return this.each(function(){
  new jQuery.fx.ScrollTo(this, o);
 });
};

jQuery.fx.ScrollTo = function (e, o)
{
 var z = this;
 z.o = o;
 z.e = e;
 z.p = jQuery.getPos(e);
 z.s = jQuery.getScroll();
 z.clear = function(){clearInterval(z.timer);z.timer=null};
 z.t=(new Date).getTime();
 z.step = function(){
  var t = (new Date).getTime();
  var p = (t - z.t) / z.o.duration;
  if (t >= z.o.duration+z.t) {
   z.clear();
   setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);
  } else {
   st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;
   sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;
   z.scroll(st, sl);
  }
 };
 z.scroll = function (t, l){window.scrollTo(l, t)};
 z.timer=setInterval(function(){z.step();},13);
};