// xWinScrollTo, Copyright 2003-2006 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

var xWinScrollWin = null;
function xWinScrollTo(win,x,y,uTime) {
  var e = win;
  if (!e.timeout) e.timeout = 25;
  var st = xScrollTop(e, 1);
  var sl = xScrollLeft(e, 1);
  e.xTarget = x; e.yTarget = y; e.slideTime = uTime; e.stop = false;
  e.yA = e.yTarget - st;
  e.xA = e.xTarget - sl; // A = distance
  if (e.slideLinear) e.B = 1/e.slideTime;
  else e.B = Math.PI / (2 * e.slideTime); // B = period
  e.yD = st;
  e.xD = sl; // D = initial position
  var d = new Date(); e.C = d.getTime();
  if (!e.moving) {
    xWinScrollWin = e;
    _xWinScrollTo();
  }
}
function _xWinScrollTo() {
  var e = xWinScrollWin || window;
  var now, s, t, newY, newX;
  now = new Date();
  t = now.getTime() - e.C;
  if (e.stop) { e.moving = false; }
  else if (t < e.slideTime) {
    setTimeout("_xWinScrollTo()", e.timeout);

    s = e.B * t;
    if (!e.slideLinear) s = Math.sin(s);
//    if (e.slideLinear) s = e.B * t;
//    else s = Math.sin(e.B * t);

    newX = Math.round(e.xA * s + e.xD);
    newY = Math.round(e.yA * s + e.yD);
    e.scrollTo(newX, newY);
    e.moving = true;
  }  
  else {
    e.scrollTo(e.xTarget, e.yTarget);
    xWinScrollWin = null;
    e.moving = false;
    if (e.onslideend) e.onslideend();
  }  
}


// xScrollTop, Copyright 2001-2006 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xScrollTop(e, bWin)
{
  var offset=0;
  if (!xDef(e) || bWin || e == document || e.tagName.toLowerCase() == 'html' || e.tagName.toLowerCase() == 'body') {
    var w = window;
    if (bWin && e) w = e;
    if(w.document.documentElement && w.document.documentElement.scrollTop) offset=w.document.documentElement.scrollTop;
    else if(w.document.body && xDef(w.document.body.scrollTop)) offset=w.document.body.scrollTop;
  }
  else {
    e = xGetElementById(e);
    if (e && xNum(e.scrollTop)) offset = e.scrollTop;
  }
  return offset;
}


// xScrollLeft, Copyright 2001-2006 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xScrollLeft(e, bWin)
{
  var offset=0;
  if (!xDef(e) || bWin || e == document || e.tagName.toLowerCase() == 'html' || e.tagName.toLowerCase() == 'body') {
    var w = window;
    if (bWin && e) w = e;
    if(w.document.documentElement && w.document.documentElement.scrollLeft) offset=w.document.documentElement.scrollLeft;
    else if(w.document.body && xDef(w.document.body.scrollLeft)) offset=w.document.body.scrollLeft;
  }
  else {
    e = xGetElementById(e);
    if (e && xNum(e.scrollLeft)) offset = e.scrollLeft;
  }
  return offset;
}


// xGetElementById, Copyright 2001-2006 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xGetElementById(e)
{
  if(typeof(e)=='string') {
    if(document.getElementById) e=document.getElementById(e);
    else if(document.all) e=document.all[e];
    else e=null;
  }
  return e;
}


// xDef, Copyright 2001-2006 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xDef()
{
  for(var i=0; i<arguments.length; ++i){if(typeof(arguments[i])=='undefined') return false;}
  return true;
}


// xNum, Copyright 2001-2006 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xNum()
{
  for(var i=0; i<arguments.length; ++i){if(isNaN(arguments[i]) || typeof(arguments[i])!='number') return false;}
  return true;
}