/*
The following functions are part of X,
a Cross-Browser.com Javascript Library,
Distributed under the terms of the GNU LGPL.
Copyright 2001-2007 Michael Foster
*/
function xAniOpac(sEleId, finalOpac, uTotalTime, fnOnEnd)
{
  var ele = xGetElementById(sEleId);
  var start = xOpacity(ele);
  var disp = finalOpac - start; // total displacement
  var freq = (1 / uTotalTime); // frequency
  var startTime = new Date().getTime();
  var tmr = setInterval(
    function() {
      var elapsedTime = new Date().getTime() - startTime;
      if (elapsedTime < uTotalTime) {
        var f = elapsedTime * freq;
        xOpacity(ele, f * disp + start);
      }
      else {
        xOpacity(ele, finalOpac);
        clearInterval(tmr);
        if (fnOnEnd) fnOnEnd();
      }
    }, 10
  );
}
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;
}
function xOpacity(e, o)
{
  var set = xDef(o);
  //  if (set && o == 1) o = .9999; // FF1.0.2 but not needed in 1.5
  if(!(e=xGetElementById(e))) return 2; // error
  if (xStr(e.style.opacity)) { // CSS3
    if (set) e.style.opacity = o + '';
    else o = parseFloat(e.style.opacity);
  }
  else if (xStr(e.style.filter)) { // IE5.5+
    if (set) e.style.filter = 'alpha(opacity=' + (100 * o) + ')';
    else if (e.filters && e.filters.alpha) { o = e.filters.alpha.opacity / 100; }
  }
  else if (xStr(e.style.MozOpacity)) { // Gecko before CSS3 support
    if (set) e.style.MozOpacity = o + '';
    else o = parseFloat(e.style.MozOpacity);
  }
  else if (xStr(e.style.KhtmlOpacity)) { // Konquerer and Safari
    if (set) e.style.KhtmlOpacity = o + '';
    else o = parseFloat(e.style.KhtmlOpacity);
  }
  return isNaN(o) ? 1 : o; // if NaN, should this return an error instead of 1?
}
function xDef()
{
  for(var i=0; i<arguments.length; ++i){if(typeof(arguments[i])=='undefined') return false;}
  return true;
}
function xStr(s)
{
  for(var i=0; i<arguments.length; ++i){if(typeof(arguments[i])!='string') return false;}
  return true;
}