var Mac = navigator.appVersion.indexOf('Mac',0) != -1;
var Win = navigator.appVersion.indexOf('Win',0) != -1;
var IE  = navigator.appName.indexOf("Microsoft Internet Explorer",0) != -1;
var NN  = navigator.appName.indexOf("Netscape",0) != -1;
var Moz = navigator.userAgent.indexOf("Gecko/",0) != -1;
var Opera = window.opera;
var Vmajor = parseInt(navigator.appVersion); // ex. 3
var Vminor = parseFloat(navigator.appVersion); // ex. 3.01

var MacIE4 = ((Mac && navigator.appVersion.indexOf('MSIE 4.',0) != -1));
var MacIE3 = ((Mac && navigator.appVersion.indexOf('MSIE 3.',0) != -1));


function scroll (target) {
  if (IE && navigator.appVersion.indexOf("MSIE 8") == -1) var targetY = target == 'body' ? 0 : document.getElementById('container').offsetTop + document.getElementById(target).offsetTop;
  else var targetY = document.getElementById(target).offsetTop;
  var y = getScrollY (targetY);
  doScroll (target, y);
}
function otherScroll (target) {
  var targetY = document.getElementById(target).offsetTop;
  var y = getScrollY (targetY);
  doScroll (target, y);
}

function getScrollY (y) {
  var winHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
  var posFoot = document.getElementById('footer').offsetTop + 150;
  if (winHeight > (posFoot - y)) y -= winHeight - (posFoot - y);
  return y;
}

function doScroll (target, y) {
  if (!MacIE3 && !MacIE4 && !NN && window.scrollTo || NN && (Vminor >= 4.75) && window.scrollTo) jumpTo(y, 0, 7, 14);
  else location.hash = target;
}

function getScrollTop () {
  if (IE) return document.documentElement.scrollTop || document.body.scrollTop;
  else if (NN) return window.pageYOffset;
  else return 0;
}

var Timer;
function jumpTo (dstY, srcY, frms, waitSec) {
  if (Timer) clearTimeout(Timer);
  if (!dstY || dstY < 0) dstY = 0;
  if (!srcY) srcY = 0 + getScrollTop();
  if (!frms) frms = 5;
  if (!waitSec) waitSec = 20;
  srcY += (dstY - getScrollTop()) / frms;
  if (srcY < 0) srcY = 0;
  posY = Math.floor(srcY);
  window.scrollTo(0, posY);
  if (posY != dstY) Timer = setTimeout('jumpTo('+ dstY +', '+ srcY +', '+ frms +', '+ waitSec +')', waitSec);
  else if (posY == dstY) clearTimeout(Timer);
  else if (posY < 1) window.scroll(0, 0);
}

function wheel (event) {
  clearTimeout(Timer);
}

if (window.addEventListener) window.addEventListener('DOMMouseScroll', wheel, false);
window.onmousewheel = document.onmousewheel = wheel;